Please consult with the Soviet side about first transferring an air division to protect the air defense of the capital[1]
(October 15, 1950)

Comrade Enlai:

Please discuss again with the Soviet side whether it is possible to initially transfer one division from the jet air force designated for city cover to Beijing, in order to protect the air defense of the capital.

Mao Zedong
21:00, October 15, 1950

[1] This is a telegram from Mao Zedong to Zhou Enlai, who was then visiting the Soviet Union.