Russia and China held joint naval drills in the Sea of Japan on Friday.
They practised how to operate together and destroy floating enemy mines with artillery fire, the Russian defence ministry said in a statement.
The war games are part of naval cooperation drills between the two countries which run from October 14 to 17, and involve warships and support vessels from Russia's Pacific Fleet, including mine-sweepers and a submarine.
Moscow and Beijing have cultivated closer military and diplomatic ties in recent years at a time when their relations with the West have soured.
Two Chinese destroyers, a submarine and two corvettes were among the vessels Beijing had sent to take part in the drills, the Russian defence ministry said, saying they had dropped anchor in the Russian far east the previous day.
The combined force would practice shooting at targets designed to imitate enemy surface ships and hold air-defence drills involving Russian SU-30SM multi-functional fighter jets and helicopters, the ministry said.
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US President Donald Trump defended the state and federal response to deadly flash flooding in Texas on Friday as he visited the stricken Hill Country region, where at least 120 people, including dozens of children, perished a week ago.
Russia pounded Ukraine with hundreds of drones and dozens of missiles on Saturday, in the fourth major attack this month, targeting western cities and killing at least two people in Chernivtsi on the border with Romania.
Thirty Kurdistan Workers Party (PKK) fighters burned their weapons at the mouth of a cave in northern Iraq on Friday, marking a symbolic but significant step toward ending a decades-long armed conflict against Turkey.