Russia is testing the readiness of a missile unit that forms part of its strategic nuclear forces, the defence ministry has said – with Russian officials having repeatedly raised the spectre of nuclear war over the West’s support for Ukraine.

Russia is testing the combat readiness of a unit equipped with Yars intercontinental ballistic missiles in a region northwest of Moscow, news agencies quoted the defence ministry as saying on Friday.

The military alliance started its annual nuclear exercise "Steadfast Noon" with up to 60 aircraft taking part on Monday.

Russia has deployed its nuclear-capable RS-24 Jars missile systems closer to NATO’s borders, raising concerns across the West. According to a statement from the Russian Ministry of Defense, strategic missile units are conducting intensive exercises along patrol routes that stretch up to 100 kilometers,