由于地缘政治上的冲突,日俄在近代曾多次开战。1931年日本关东军发动九一八事变,全面占领中国东三省,次年成立听命于日本的伪满洲国。中国的外蒙古则在苏联支持下,于1921年成立蒙古人民共和国。伪满洲国与蒙古国为邻,分别驻有日本及苏联的军队,双方经常产生边境纠纷。 Due to geopolitical conflicts, Japan and Russia have fought many times in modern times. In 1931, the Japanese Kwantung Army launched the Incident of September 18, occupying an all-round position in the three northeastern provinces of China and setting up the puppet Manchukuo to Japan in the following year. Under the support of the Soviet Union, China’s outer Mongolia established the People’s Republic of China in 1921. Puppet Manchukuo and Mongolia are neighbors, with their respective troops stationed in Japan and the Soviet Union. Both sides often have border disputes.