From attractiveness to hard hedging: US allies' response to Washington's lack of security assurance under the Obama and Trump presidencies.

America's allies have reacted differently to the uncertainty surrounding US global leadership and the return to hard power politics in the 2010s. Some allies have remained steadfast in their commitment to Washington, while others distanced themselves from the United States. Why is it so? This article develops an integrated argument that brings together different strands of the literature on alignment, to better make sense of cross-national and within-case variations in allies' strategic behavior. By examining three case studies from distinct regional contexts – Japan, Poland and Turkey – the paper shows that although these allies all shared concerns about the Obama and Trump administrations' security commitment, it was their differing perceptions of the threats posed by China and Russia's power that influenced their pursuit of either stronger alignment with the US security patron – through internal balancing for 'attractiveness' and internal hedging –, or increased strategic autonomy from Washington by pursuing hard hedging. [ABSTRACT FROM AUTHOR]