Ties between Moscow and Beijing have grown closer since Russia launched its Ukraine offensive last year, a move China has not condemned.

The Russian defence ministry said the main goal of the exercises that will run until Sunday is to "strengthen naval cooperation" between the two countries and "maintain stability and peace in the Asia-Pacific region".

The drills will include "anti-submarine missions and naval combat" and the sea and air escort of ships, the ministry said, adding there are also plans "to carry out joint artillery fire".

The Russian navy is represented by two anti-submarine ships, two corvettes as well as auxiliary ships, the ministry said.

Beijing said on Sunday it was sending five warships, including a guided-missile destroyer.

More than 30 navy aircraft are involved in the drills from both sides, including anti-submarine aircraft, helicopters and interceptors, the Russian ministry said.

China and Russia carried out a joint air patrol over the Seas of Japan and East China last month, which prompted South Korea to deploy fighter jets as a precaution.

It was the sixth such China-Russia patrol in the area since 2019.