Abstract: During the first half of the 1960s, as the relationship between Beijing and Moscow deteriorated, the Chinese Communist Party (CCP) endeavored to win over the Japanese Communist Party (JCP) under the leadership of Kenji Miyamoto. At the time, the JCP had similar goals and interests as the CCP in taking an anti-imperialist and anti-revisionist stance, disagreeing with the international orientation of the Soviet Communist Party (SCP) and resisting Moscow's interference in its internal affairs. As the discords between the CCP and the SCP came to the open between 1960 and 1963, for the first time the JCP coordinated closely with the CCP in boycotting a "tripartite agreement". Afterwards, in the great polemics of the international communist movement, the JCP further clarified its attitude in supporting the CCP. By 1964 the Sino-Soviet Split became beyond salvage. MAO Ze-dong readjusted China's foreign policy accordingly for the sake of broadening the anti-American united front and constructing an anti-Soviet united front. The CCP and the JCP supported each other politically and organizationally, advancing their cooperation significantly. In 1965, before the new Soviet leadership was able to readjust its approach toward the JCP, the CCP and the JPC joined their efforts together in boycotting the March Conference in Moscow, thus initiating a new round of anti-Soviet struggles for the year. Yet, whereas the JCP was determined to maintain independence, the "Cultural Revolution" loomed large in China, both of which, aside from other factors, cast a shadow over the CCP-JCP relationship and affected the two parties' decisions about their mutual relationship. In the circumstance of the Sino-Soviet Split, the CCP and the JCP were cooperating but actually pursuing different aspirations. In the final analysis, the CCP-JCP relationship could not ultimately escape the fact that inter-party relations of the international communist movement lacked a solid and stable pivot.

Key words: Sino-Soviet Split, Chinese Communist Party, Japanese Communist Party, Soviet Communist Party, inter-party relationship