The war games are taking place north of Azerbaijan's Absheron peninsula, where Baku is located, and will include artillery and rocket fire, the defence ministry said in a statement.

They involve six ships, seven planes and more than 400 servicemen, it added.

"The activities... do not pose any threat and do not impose restrictions on the economic activities of the Caspian littoral states," it added.

Russia has so far kept its distance from the conflict between Azerbaijan and Armenia over the Armenian-controlled Nagorno-Karabakh region of Azerbaijan.

Urging an end to fighting, Moscow last week brokered a ceasefire between the two sides that has so far failed to hold.

But Armenia, unlike Azerbaijan, is a member of the Moscow-led Collective Security Treaty Organisation (CSTO) military alliance and Yerevan has made clear it is hoping for Russian backing.

With protests still pressuring Belarusian President Alexander Lukashenko after disputed elections, CSTO forces have also been taking part in joint military exercises this week in Belarus.

The exercises involving CSTO peacekeeping forces have been taking place in the Vitebsk region in the east of Belarus and are called "Indestructible Brotherhood".