新中国成立以前,中苏关系经历了长期的曲折和反复的过程。在抗战时期,前苏联和旧中国的关系又经历了一次大起大落。苏联出于其对外战略的需要,从1937年到1945年,对当时的中国政府采取了“大转弯”的政策。三件大事反映了两国关系的变化。第一个事件,抗战初期苏联积极军事援助中 Before the founding of new China, the Sino-Soviet relations experienced a long period of tortuous and repetitive processes. During the war of resistance against Japan, the relations between the former Soviet Union and the old China experienced another ups and downs. The Soviet Union, out of its need for foreign strategy, adopted a policy of “turning a big corner” toward the then Chinese government from 1937 to 1945. Three major events reflect the changes in the relations between the two countries. The first incident, during the early Anti-Soviet Soviet active military aid