Trump II and US Nuclear Assurances in the Indo-Pacific

A changing military balance of power

Regional and global economic, political, and technological developments are shift­ing the balance of power in the Asia-Pacific region in very different ways than in Europe. After all, the starting position is completely different: Russia’s economy is only one-tenth the size of the EU’s, and Europe lacks political resolve and operational military capabilities rather than resources per se. The critical questions are whether the United States would defend Europe in a geographically limited crisis, whether the Western European nations would go to war for their Eastern European allies, and whether the current forces are adequate to deter or repel Russian aggression.

In contrast, China’s economy is almost two and a half times larger than the com­bined economies of Australia, Japan, and South Korea – a difference that roughly mirrors the disparity in military spending. While Europeans have consciously delegated their security to Washington, US allies in the Western Pacific have limited options for developing their own conventional capa­bilities to counterbalance China.

Hence, the US allies are primarily concerned with China’s determination to re­shape regional dynamics. Under Xi Jinping, Beijing has pursued a more confrontational foreign policy designed to advance China’s regional interests and diminish, if not eliminate, US influence across the Pacific. China has proved willing to underpin its combative diplomacy through both costly economic measures and the rapid modernisation of its armed forces. It is still assumed that the US will continue to play the lead­ing military role for the time being, as Washington retains superiority in conventional and nuclear capabilities as well as in many other areas. However, China is rapidly catching up and asserting its regional claims, making it increasingly difficult for the United States to effectively project power so far from its own shores. This is why allies fear that China could dominate the Asia-Pacific region in future.

Against this backdrop, many see Taiwan’s future as the harbinger of the region’s pos­sible development. If Beijing were to con­trol this central component of the first island chain, it would gain both military and political leverage over the East and South China Seas – both of which are stra­tegically important. To signal its resolve, Beijing frequently conducts demonstrations of military power such as in the airspace separating the mainland from Taiwan. The trans-Pacific allies suspect that China could (soon) leverage both conventional and nuclear capabilities to present them with a fait accompli, thus gaining control over Taipei before the US could intervene. This would also damage Washington’s credibility as the guardian of regional order. Whether Beijing would indeed wage war against the United States over Taiwan, or whether it merely seeks to alter the military balance of power by exposing Washington, Taipei, and regional US allies to unacceptable escala­tion risks remains unclear – but the very fact that China keeps its intentions ambigu­ous raises worst-case fears.

Nuclear threats

In recent years, Beijing has been engaged in a major expansion of its nuclear arsenal. According to US forecasts, China could double the number of its nuclear warheads from the current estimate of 500 nuclear warheads by 2030. While Russia and the United States would still dwarf China’s nuclear forces numerically, Beijing appears to be aiming for the same qualitative league of strategic nuclear weapons systems as possessed by Washington and Moscow. The exact motives behind China’s nuclear build-up remain controversial. Yet the types of weapons and the pace of their development suggest that Beijing would at least like to weaken Washington’s escalation dominance in a crisis. Such developments could theo­retically strengthen the mutual nuclear deterrent between China and the US. On the one hand, it could reduce the risk of a global war. On the other hand, for Washing­ton’s Pacific allies this means that their protective power could no longer credibly threaten nuclear escalation and effectively deter Beijing. As a result, they would be outgunned in a conventional war with China.

North Korea’s foreign policy, coupled with its nuclear build-up is a further cause for concern. According to estimates, Pyong­yang could currently have 90 nuclear war­heads at most at its disposal. However, it has significantly diversified its delivery systems. North Korea emphasizes a nuclear doctrine with which it could drive a wedge between the Pacific allies by threatening South Korea with tactical nuclear strikes and the US with strategic nuclear strikes. In addition, Washington and its allies perceive North Korea’s threshold for using nuclear weapons to be very low, as they assume that Pyongyang is also trying to deter con­ventional attacks in this way.

Finally, the policy changes Moscow has implemented are intensifying regional con­cerns with respect to the future behaviour of China and North Korea. Russia maintains important military facilities in North-East Asia, militarises the Kuril Islands, and con­ducts strategic air and naval patrols with China across the Western Pacific. Moscow’s focus, however, is clearly on Europe. Never­theless, Australia, Japan, and South Korea fear the concrete consequences of Russia’s cooperation with Beijing and Pyongyang. It is clear that this cooperation fuels Moscow’s war in Ukraine. In the worst-case scenario, closer military cooperation could result in more coordination and opportunistic be­haviour to exploit each other’s conflicts or challenge the US and its allies with addi­tional crises. What is more likely, however, is not a trilateral front, but a triangular dy­namic that remains susceptible to mistrust, power calculations, and priority setting by the respective rulers – and which can none­theless boost existing challenges to regional security and non-proliferation. Moreover, the outcome of Moscow’s on­going war of aggression in Ukraine could set risky precedents for revisionist agendas in East Asia. At this point, China and North Korea could learn from Russia’s nuclear rhetoric how allies can be unsettled and deterred from going “too far” in supporting Ukraine.

Converging interests and (radical) alternatives

The challenges in the Asia-Pacific region could have a more serious impact on the regional and global order than the conflicts in Europe. They are therefore already influ­encing the balance of interests and thus the room for manoeuvre of the actors involved.

First, there is a bipartisan consensus in Washington that American influence in the Pacific must be preserved. Most see the larger Indo-Pacific as the strategic centre of gravity, perceive US influence in the region as key to sustaining America’s preeminent position in international relations, and conclude that containing China is a must. Thus, even in a highly partisan political environment, the status of Taiwan and its treaty alliances with Australia, Japan, and South Korea remain essentially of unques­tioned importance to the United States.

Second, Washington needs its allies in the Western Pacific. As the military gap with China narrows, the US military must rely on the critical bases, logistical support, and complementary capabilities of regional allies. Consequently, Australia, Japan and South Korea host significant US military forces, facilitating rapid deployment and sustained operations in the region. The US is not only seeking to strengthen bilateral security cooperation and can also work with Australia and Japan as indispensable partners for regional formats – such as the Quad that includes India – to pool resources to contain Beijing’s ambitions. Conversely, given China’s considerable economic power, any attempt to constrain its technological or financial capabilities requires wide-ranging cooperation. It is thus unsurprising that the Biden adminis­tration has actively sought to garner sup­port across the Indo-Pacific region to foster economic partnerships, supply chain resili­ence, technology transfers and research collaborations.

Third, allies in the Western Pacific are prepared to contribute to more effective military action. Many European govern­ments, on the other hand, take US security measures for granted and are reluctant to divert funds from social and other purposes to their armed forces. Australia, Japan, and South Korea each have extensive trade rela­tions with China, having tied their prosper­ity to Beijing. To ensure that this beneficial balance can be maintained, Canberra, Tokyo, and Seoul have reliably invested in allied deterrence and defence. Australia and South Korea have done and continue to do so, even under governments that are more sceptical about relations with Washington.

Fourth, although US allies in the Western Pacific greatly benefit from the current strategic arrangements, they have alter­native (even if not attractive) options avail­able – and Washington is acutely aware of this reality. On the one hand, policymakers in Washington suspect that if mistrust of US commitment were to reach an intoler­able level, its Pacific allies might decide to bandwagon with China. As Australia has no territorial dispute with Beijing, and Japan and South Korea have only one limited territorial dispute respectively with China, their concerns are more economic and po­liti­cal in nature. A different regional archi­tecture, though significantly less attractive, would not directly threaten their funda­mental interests and, therefore, would probably be tolerable. On the other hand, Japan and South Korea have the technical capabilities and sufficiently limited regional institutional ties – in Seoul also significant domestic political support – to constrain China’s coercive capabilities by acquiring their own nuclear weapons. In the absence of US reassurance, they could combine the two alternatives and side with Beijing from behind their own nuclear shield.

Given these four fundamentals, there is relative confidence in Canberra, Tokyo, and Seoul that the US will continue with its secu­rity architecture in – and therefore with its extended nuclear deterrent for – the Western Pacific, whether or not Donald Trump wins the 2024 presidential election. Moreover, both Trump and his supporters have repeatedly struck a confrontational tone toward China, emphasising their wil­lingness to increase US power projection through military means.

Counter-balancing by the United States and its allies

Amid a shifting politico-military landscape and aligned US and allied interests in pre­serving the status quo, a concerted effort to counterbalance China’s military expansion is evident. These efforts are extremely ex­pensive. The sunk costs of this effort strongly suggest to all concerned that, regardless of who occupies the White House, the major strategic question facing the future admin­is­tration will likely be how to effectively con­tain China while both maintaining stra­tegic deterrence against Russia and avoiding the escalation of potential crises. For now, the United States seems to pursue a four-pronged strategy that involves developing additional nuclear capabilities, building up conventional options, enhancing allies’ capabilities, and expanding security co­operation.

First, planners and pundits in Washington are assessing how to make better use of US nuclear options. While a major nuclear modernisation effort is underway, a grow­ing number of experts and politicians have concluded that the US arsenal needs to be expanded. In addition, the legislative branch has been pushing the Pentagon to pursue additional nuclear options, such as a nuclear-armed cruise missile (SLCM-N). The Trump administration already called for this in 2018 and would likely continue to pursue it, if it returns to power. More­over, some in the hawkish Republican camp are even calling for the first use of such low-yield nuclear weapons to be con­sidered in order to offset China’s operational advantages and prevent an invasion of Taiwan – but it is unclear how much weight such voices could carry in a second Trump term.

Second, and more importantly, the US government is building up its conventional capabilities. Although many Democrats criticised the Trump administration’s 2019 decision to abandon the legal prohibition on deploying intermediate-range missiles, the Biden administration has pursued this same course. As a result, US armed forces will soon be deploying such missile systems to their European and Pacific bases; a planned relocation to the US base in Wies­baden was recently announced. For Asia, it has already been announced that the Dark Eagle hypersonic system will be fielded on Guam. In order to equalise the conventional balance of power with China, however, the various other US medium-range systems would have to be stationed on allies’ terri­tory. Given the high probability that Beijing would respond with harsh economic retalia­tion, it remains unclear whether – or under what conditions – Canberra, Tokyo, or Seoul would agree to such deployments.

Third, the US government has been work­ing with its allies in the region to im­prove their own military capabilities. First, Australia, Japan, and South Korea continue to develop their national capabilities, par­ticularly where long-range strike capabilities and strategic naval assets are concerned. Sec­ond, the US government seeks to strengthen its allies’ early warning and missile defence capabilities. It is especially relevant that Washington appears to have shifted its posi­tion to weigh deterrence challenges more heavily than proliferation concerns. Indicative of this is the unprecedented technology transfer involved in providing Australia with stealthy nuclear-powered submarines. This transfer requires an un­paralleled level of verification to make it transparent that Canberra does not divert some of the highly enriched uranium needed for submarine propulsion to build its own nuclear weapons. Another example is the US decision from 2021 to lift all restrictions that had long been placed on South Korea’s missile development programs. Equally important is the widespread sale of Toma­hawk cruise missiles in recent years, includ­ing to Australia and Japan.

Finally, while bilateral alliances with Washington continue to be characterised by patron-client relationships, Washington appears committed to empowering regional powers not only by helping enhance their capabilities, but also by expanding security cooperation and allies’ roles therein. For instance, the Biden administration wants Japanese shipyards to regularly overhaul US warships, which allows for their constant presence in East Asia. It also upgraded bi­lateral consultations which carve out a South Korean role in US nuclear operations. Further, it is pursuing technology transfers in advanced military capabilities that will buttress Australia’s strategic reach. Although these alliance initiatives bear the hall­marks of the Biden administration, they fit the “burden-sharing while preserving influ­ence” mantra. This tactic characterised Trump’s term in office and is currently aspired to by broad segments of the Repub­lican Party. Thus, while officials and experts in Australia, Japan, and South Korea expect communication and coordination mishaps, procedural quibbles, funding challenges, and implementation delays, these individ­uals strongly believe that bipartisan US sup­port for these measures will remain strong.

Nevertheless, concerns abound

Although some of Trump’s domestic sup­porters would welcome any reduction in US commitments abroad, a second adminis­tration would have to face the reality that abandoning extended nuclear deterrence remains fundamentally at odds with its primary goals. Abandoned by their long-time protector and facing massive threats, former allies would likely seek to appease China, and could acquire nuclear arsenals independently. Such developments would run counter to the interests of any US ad­ministration, including a Trump White House. Fears of nuclear abandonment are therefore not the dominant concern, leav­ing plenty of room for allies’ other worries.

The Pacific allies invest relatively heavily in national and joint deterrence, and defence. But they are also worried about Trump’s penchant for pressuring allies to make con­cessions. Most in Seoul, for example, expect at least a repeat of the tough cost-sharing negotiations of the first term. Trump and his supporters have been vocal about demand­ing increased financial contributions from Seoul for the US troops stationed on the Korean Peninsula, frequently coupled with threats to withdraw some or all of those forces, references to the trade imbalance, and downplaying the threats posed by North Korea. Congressional support ensures the presence of US soldiers, but the White House has considerable leeway in determin­ing the size and mandate of these deployments – and many expect Trump to use security commitments to extract economic concessions from allies. Conversely, some in Canberra and Tokyo worry that a Trump administration would seek to renegotiate various military procurement agreements to shore up US financial gains – but few believe that existing agreements would be revoked in the course of such disputes.

Another fear in Australia, Japan, and South Korea is that a second Trump admin­istration will reduce or abandon the Biden White House’s various regional security cooperation initiatives and want all rela­tions to again go through Washington first. On the one hand, Trump and his advisers may be pleased with the burden-sharing benefits associated with these new forms of cooperation and continue to pursue them. On the other hand, a GOP-led administration might seek a return to the traditional centralising “hub-and-spokes” system in order to exert more control over allies. The allies therefore fear that without US leader­ship, these intergovernmental initiatives are likely to stagnate, and competition among protégés for the attention of the common patron will be reignited. This might apply particularly to the very practical, but politi­cally sensitive, trilateral partnership be­tween Japan, South Korea and the United States.

Less pronounced than the aforemen­tioned fears are concerns about Trump’s “deal-making” tendencies, such as being abandoned in a costly crisis or entangled in a regional conflict. Ambiguity surrounding Trump’s policies vis-à-vis China, North Korea and Russia reflect general uncertainties about future developments in Europe and East Asia as well as Trump-specific inconsistencies. With regard to China, most expect confrontational security and eco­nomic policies, while a few fear that Trump will seek a grand bargain with Xi. Trump has kept his stance on the status of Taiwan ambiguous: he could either reject all sup­port for Taiwan or, if faced with Chinese intransigence, decide to explicitly commit to defending Taipei. While the former would expose US allies to potential Chinese coercion, the latter could lead to an open military conflict with Beijing – and many allies do not trust Trump’s resolve in such a crisis. Regarding North Korea, most hope that Trump’s failed summitry with Kim Jong Un served as a sufficient lesson. How­ever, some worry he may seek to prove that personal relationships facilitate agreements that would otherwise be difficult to achieve. For example, he could again try to persuade Kim Jong Un to stop his nuclear build-up by offering economic incentives (thus effec­tively breaking sanctions). As a quid pro quo for Seoul, Trump could go so far as to quietly accept South Korean nuclear pro­liferation. Finally, concerning Russia, many fear that Trump might propose a deal to Putin to freeze the conflict in Ukraine, an approach from which Xi could draw con­clusions for revisionism in East Asia.

Implications for Europe

As Trump is prone to miscalculations and erratic behaviour, caution is required when trying to predict his future policy after re-election. Nevertheless, it is important to understand why Australia, Japan, and South Korea are less concerned about US nuclear assurances. Three conclusions can be drawn from this analysis for Europe.

First, even if Trump is re-elected, fundamental changes in Washington’s relations with its Pacific allies are unlikely – which is good news for Europe. For one thing, European economic success depends on the absence of open conflict between China and the US. For another, stable relations in the Asia-Pacific are indirectly a boon to NATO, since US security provision in Europe is heavily dependent upon the success of its more important commitments across the Pacific. Nevertheless, considerable uncertainties remain due to structural challenges as well as Trump’s political agenda and per­sonal idiosyncrasies. However, the pressure from Washington on Europe to adapt its China policy is likely to increase under a second Trump administration, especially as it is likely to be almost exclusively com­posed of China hardliners (China hawks).

Second, in the face of these risks, Europeans should recognise that Washington and the Pacific allies will expect economic-political rather than military contributions from Europe. It would therefore be advan­tageous if European governments could use their weight within the global economic system to support the US in containing China’s military expansion. If Europe now helps to influence Beijing’s technological and financial capabilities, it could imply European willingness to impose sanctions on China in the event of war. This would also send a strong signal against revisionism in East Asia. Given Trump’s unpredictability, steps that seem costly today may prove worthwhile in retrospect if regional stability in Asia is severely damaged.

Last but not least, one valuable lesson can be gleaned from understanding why US allies in Asia hold more optimistic expec­tations about a potential second Trump administration. Ultimately, the source of their optimism lies in Washington’s depend­ence on its allies and their readiness to take on greater responsibility. Arguably, this particular equation is primarily a result of exogenous factors – such as the region’s strategic importance und China’s ambitions. But it should also now be clear to Europe’s decision-makers, experts and public that the more they invest in their own capabil­ities to influence regional security policy, the less they will have to worry about Washington’s vacillations.