A missile being test-fired in the White Sea, Russia, on May 22, 2018. (Photo: Xinhua)

Russia's Project 955 Borei-class strategic nuclear submarine Yuri Dolgoruky has successfully conducted a test salvo launch of four missiles, Russian Defense Ministry said Wednesday.

Four Bulava ballistic missiles from the designated area in the White Sea were fired Tuesday to targets at the Kura range on the Kamchatka Peninsula in far eastern Russia, a ministry statement said.

The test confirmed the combat readiness of the Project-955 Borei strategic submarine and the Bulava missile system, the statement said

Yuri Dolgoruky is the lead vessel of Project 955 Borei-class, which has a full displacement of 24,000 tonnes, and is about 160 meters long and 13 meters wide.

The underwater cruiser is armed with a set of sea-launched Bulava intercontinental ballistic missiles as well as torpedoes. The submarine can also be armed with cruise missiles.