Russia's Navy fired anti-ship and hypersonic missiles at a fictitious target in the Sea of Japan, the Russian Defense Ministry said on Tuesday.

"In the waters of the Sea of Japan, Pacific Fleet ships fired Musket-class cruise missiles at an imaginary enemy naval target," it said on its Telegram account.

"The target, which was about 100 kilometres away, was hit by two Mosket cruise missiles," it said.

The B-270 Musket is a supersonic medium-range cruise missile of Soviet origin that can destroy a ship from a range of up to 120 kilometers.

The missile launch comes a week after two Russian strategic bombers capable of carrying nuclear warheads flew over the Sea of Japan for more than 7 hours on a flight Moscow said was "scheduled".