Thailand was a key ally of the United States after WWII, serving as a bulwark against communism in Southeast Asia and as a base for US troops during the Vietnam War. In return, the US provided it with millions of dollars in military and economic aid, and staunchly supported the country's various despotic regimes. And yet, the twenty-first century has witnessed a striking reversal in Thailand's foreign relations: China, once a sworn enemy, is becoming...