The Washington-based Institute for the Study of War noted that cooperation with China has allowed Russia to bypass Western sanctions on imports of electronics for drone production. Ukraine’s military intelligence estimates that Russia receives up to 65% of components for its Geran drones from China. Beijing rejects the claims.

New waves of deadly Russian missiles pounded Ukraine overnight Sunday while long range drone attacks by Kyiv sparked travel chaos at Moscow’s airports.

Russia attacked cities across Ukraine with hundreds of drones and a missile strike, hitting energy infrastructure and wounding at least 15 people.