The Association of Southeast Asian Nations (ASEAN) is a pillar of the postwar order in East Asia. Founded in 1967 by Indonesia, Malaysia, the Philippines, Singapore, and Thailand, principally to coordinate security policy during the Cold War, the bloc was significantly enlarged in the 1990s, when it took in low-income countries Burma (Myanmar), Cambodia, Laos, and Vietnam. Today, the complex relationship between China and ASEAN combines aspects of cooperation and tension. China's aggressive posturing in the South China Sea illustrates its increasing naval capabilities and willingness to...