In an increasingly contested Indo-Pacific, the United States, Australia and their regional allies and partners face a myriad of strategic challenges that cut across every level of the competitive space. Driven by China’s use of multidimensional coercion in pursuit of its aim to displace the United States as the region’s dominant power, a new era of strategic competition is unfolding. At stake is the stability and character of the Indo-Pacific order, hitherto founded on American power and longstanding rules and norms, all of which are increasingly uncertain. The challenges that Beijing poses the region operate over multiple domains and are prosecuted by the Chinese Communist Party through a whole-of-nation strategy. In the grey zone between peace and war, tactics like economic coercion, foreign interference, the use of civil militias and other forms of political warfare have become Beijing’s tools of choice for pursuing incremental shifts to the geostrategic status quo. These efforts are compounded by China’s rapidly growing conventional military power and expanding footprint in the Western Pacific, which is raising the spectre of a limited war that America would find it difficult to deter or win. All of this is taking place under the lengthening shadow of Beijing’s nuclear modernisation and its bid for new competitive advantages in emerging strategic technologies. Strengthening regional deterrence and counter-coercion in light of these challenges will require the United States and Australia — working independently, together and with their likeminded partners — to develop more integrated strategies for the Indo-Pacific region and novel ways to operationalise the alliance in support of deterrence objectives. There is widespread support for this agenda in both Washington and Canberra. As the Trump administration’s 2018 National Defense Strategy makes clear, allies provide an “asymmetric advantage” for helping the United States deter aggression and uphold favourable balances of power around the world. Australia’s Minister for Defence Linda Reynolds mirrored this sentiment in a major speech in Washington last November, observing that “deterrence is a joint responsibility for a shared purpose — one that no country, not even the United States, can undertake alone.” Forging greater coordination on deterrence strategy within the US-Australia alliance, however, is no easy task, particularly when this undertaking is focussed on China’s coercive behaviour in the Indo-Pacific. Although Canberra and Washington have overlapping strategic objectives, their interests and threat perceptions regarding China are by no means symmetrical. Each has very different capabilities, policy priorities and tolerance for accepting costs and risks. Efforts to operationalise deterrence must therefore proceed incrementally and on the basis of robust alliance dialogue. To advance this process of bilateral strategic policy debate, the United States Studies Centre and Pacific Forum hosted the second round of the Annual Track 1.5 US-Australia Deterrence Dialogue in Washington in November 2019, bringing together US and Australian experts from government and non-government organisations. The theme for this meeting was “Operationalising Deterrence in the Indo-Pacific,” with a focus on exploring tangible obstacles and opportunities for improving the alliance’s collective capacity to deter coercive changes to the regional order. Both institutions would like to thank the Australian Department of Defence Strategic Policy Grants Program and the US Defense Threat Reduction Agency for their generous support of this engagement. The following analytical summary reflects the authors’ accounts of the dialogue’s proceedings and does not necessarily represent their own views. It endeavours to capture, examine and contextualise a wide range of perspectives and debates from the discussion; but does not purport to offer a comprehensive record. Nothing in the following pages represents the views of the Australian Department of Defence, the US Defense Threat Reduction Agency or any of the other officials or organisations that took part in the dialogue.