A nuclear submarine, Aegis destroyer and various other warships were involved in the exercises which would last till May 10 under the signboard of combined anti-submarine exercises.

They plan to hurl even the U.S. nuclear-powered aircraft carrier Nimitz into the naval strike drill in the East Sea of Korea in the wake of the saber-rattling.

They are intensifying the anti-north war drills with reinforced nuclear force in a bid to ignite a nuclear war at any cost.