Former president Chiang Kai-shek (蔣介石) is said to have strongly resented his US counterpart, then-president Richard Nixon, for having “betrayed” him by going to Beijing and shaking hands with then-Chinese leader Mao Zedong (毛澤東) and Chinese premier Zhou Enlai (周恩來). However, declassified US diplomatic documents show Nixon was a complex strategist who was concerned about Taiwan.