Russia moved ahead on Thursday with a plan to deploy tactical nuclear weapons in Belarus, whose leader said the warheads were already on the move, in the Kremlin's first deployment of such bombs outside Russia since the 1991 fall of the Soviet Union.

The U.S. State Department denounced the deployment plan, but said Washington had no intention of altering its position on strategic nuclear weapons or seen any signs Russia was preparing to use a nuclear weapon.

Russian President Vladimir Putin says the United States and its allies are fighting an expanding proxy war against Russia after the Kremlin chief sent troops into Ukraine 15 months ago.