The Joint Institute for Nuclear Research discusses plans for scientific research and development from 1966 through 1970, and Chinese representatives announce their plan to withdraw from the Joint Institute on 1 July, 1965

The Soviet Central Committee informs their Chinese counterparts that, in light of the arms reduction talks taking place in Geneva, Soviet nuclear assistance must cease. The Chinese had requested a sample atomic bomb and technical data, but the Soviet feared that doing so would imperil the efforts of the socialist countries in Geneva.

A letter from the Chinese Vice Minister of Foreign Affairs to the Soviet Chargé informing him that revisions must be made to the “Agreement on the Provision of Technical Assistance from the Union of Soviet Socialist Republics to the People’s Republic of China in Establishing an Atomic Energy Industry,” and that until it is revised the delivery of technical equipment should be delayed.

A letter to Zhou Enlai informing him that the industrial development plan for China's atomic energy program has not been finalized and that the technical agreement with the Soviet Union must be delayed.