This is a relationship of mutual assistance. On the one hand, the Soviet Union's diplomatic strategy in the Far East can not be separated from China's cooperation and sacrifice, so that it eventually fell into the dilemma of fighting on both sides; On the other hand, China helped the Soviet Union from the supply of strategic materials. The Soviet Union made three generous loans to China, demanding that China repay the loans with military strategic materials. The strategic mineral products provided by China to the Soviet Union are of inestimable strategic significance to the development of Soviet military industry, while the agricultural products provided are of great strategic significance on the premise of the massive loss of Soviet territory and the reduction of agricultural production. Sending air force volunteers to help China is an established measure for the Soviet Union to implement its diplomatic strategy in the Far East. The volunteer team went to China to participate in the war and had military tasks: First, they were familiar with the performance of Japanese aircraft. The famous "shock" tactics were invented on this basis; The second is to understand the tactics of the Japanese Air Force and form a set of effective tactics against the Japanese Air Force in combat; The third is to sum up the experience of fighting with the Japanese army. Each volunteer team member must submit a summary report after returning home by rotation.