In 1949, after the end of the civil war and establishing of the communists' power in China, the relations between the Soviet Union and China reached a new phase. The establishment of friendly links with China became one of the main priorities of the Soviet foreign policy. In December 1949, by the invitation of the Soviet authorities, the government delegation of the People's Republic of China, headed by Mao Zedong, visited Moscow, and stayed in the Soviet capital till February 15, 1950. Mao was received by Stalin, head of the Soviet Union. As the result of their negotiations, the agreement upon friendship and mutual assistance between the two countries was signed. In accordance with it, the Soviet Union would give China great economic, financial, military and cultural assistance. After the war in Korea (1950-1953), China appeared in the international isolation. This factor influenced the acceleration of the process of its linkage to the Soviet Union. In the last years of Stalin's life, the relationships between him and Mao were noticeably cooled. The Soviet Union accused Mao in violating some dogmas of the Marxist-Leninist learning. In 1953 after Stalin's death, N. Khrushchev became the Soviet leader. His and Mao's relationships did not have a good start, causing the gradual worsening of the situation and since the early 1960s, and the break of the links between the two countries.