In a series of strikes earlier in the war now in its fourth year, Ukraine sank several Russian warships in the Blacks Sea, crippling Moscow’s naval capability and forcing it to redeploy its fleet from Russia-occupied Crimea to Novorossiysk.

By Gleb Bryanski MOSCOW (Reuters) -Ukrainian drones targeted St. Petersburg on Sunday, Russian authorities said, forcing the airport to close for five hours as Vladimir Putin marked Russia's Navy Day in the city,

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.