The four works reviewed in this essay examine the evolving character of bilateral US alliances with Japan and South Korea. As Japan and South Korea constructed highly developed economies, their relations with the United States became more equalized. Rather than supplicating clients, both have become essential partners in Washington's geopolitical calculus. All of these authors see potential threats emerging to these alliances as a result of America's recent turn to isolationism; however, structural linkages at the institutional level remain intact. The United States continues to supply security to meet evolving regional demands through a bilateral framework.

Terence Roehrig's Japan, South Korea, and the United States Nuclear Umbrella examines the geopolitical implications of extended deterrence in Northeast Asia. The narrative is aptly historicized but focuses mainly on contemporary developments. Roehrig argues that while it is highly unlikely that the United States will ever launch a nuclear strike to defend Japan or...

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