80 years ago today, on August 14th, 1945 (July 7th, 1945 in the lunar calendar), the Kuomintang signed the Sino-Soviet Treaty of Friendship and Alliance with the Soviet Union. On August 14, 1945, the Kuomintang government and the Soviet Union signed the Sino-Soviet Treaty of Friendship and Alliance in Moscow. Main contents: the two countries gave each other assistance and support in the war against Japan; Jointly prevent Japan from invading again after the war; The two sides cooperate in a friendly manner and provide each other with possible economic assistance. After the founding of the People's Republic of China, according to the exchange of letters when the Sino-Soviet Treaty of Friendship, Alliance and Mutual Assistance was signed in 1950, this treaty became invalid.