China and the Russian Federation agreed to strengthen military and military-technical cooperation and expand the scale and geography of joint exercises.

This is stated in a joint statement on further deepening relations of comprehensive partnership and strategic interaction between the states, published on the Kremlin website, Censor.NET reports with reference to Interfax-Ukraine.
“The parties will continue to strengthen military and military-technical cooperation for the benefit of the peoples of Russia and China, as well as global and regional security,” the document says.
“The parties will deepen mutual trust and interaction between the armed forces, expand the scale and geography of joint exercises, regularly carry out joint sea and air patrols, develop exchanges and cooperation both bilaterally and within multilateral formats, bringing military cooperation between Russia and China to a higher level,” the statement also notes. Джерело: https://censor.net/ua/n3551151
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They have already been doing this, just now they aren’t even trying to hide it.