The U.S. National Security Council spokesman has suggested the best way for Moscow's tankers to avoid the British depleted uranium munitions being sent to Ukraine would be to retreat back across the border. London announced on Monday that it would send depleted uranium tank rounds—which are particularly effective in piercing enemy armor—along with the Challenger 2 main battle tanks being provided for Kyiv's use. The news touched off a furious reaction in Russia, where President Vladimir Putin falsely equated the munitions to nuclear weapons. NSC spokesman John Kirby on Wednesday dismissed the Kremlin's concerns about the depleted uranium munitions during...