Book excerpt: East Asia was a major focus of struggle between the United States and the Soviet Union during the Cold War of 1945 to 1991, with multiple "hot" and "cold" conflicts in China, Korea, and Vietnam. The struggle for predominance in East Asia, however, largely predated the Cold War, as this book shows, with many examples of the United States and Russia/the Soviet Union working to exercise and increase control in the region. The book focuses on secret treaties, 26 of them, signed from the mid-1890s through 1950, when secret agreements between China and the USSR, including several concerning the Chinese Eastern Railway, gave Russia greater control over Manchuria and Outer Mongolia. One of the most important was negotiated in 1945, when Stalin signed the Sino-Soviet Friendship Treaty with Chiang Kai-shek and the Chinese Nationalists, that included a secret protocol granting the Soviet Navy sea control over the Manchurian littorals. This secret protocol excluded the US Navy from landing Nationalist troops at the major Manchurian ports, thereby guaranteeing the Chinese Communist victory in Northeast China; from Manchuria, the Chinese Communists quickly spread south to take all of Mainland China. To a large degree, therefore, this formerly undiscussed secret diplomacy set the underlying conditions for the Cold War in East Asia.