Britain said on Thursday the "most dangerous moment" in the West's standoff with Moscow appeared imminent, as Russia held military exercises in Belarus and the Black Sea following the buildup of its forces near Ukraine.
Ukraine also staged war games and the United States urged Americans in the country to leave immediately due to increased threats of Russian military action. But leaders on all sides signalled they hoped diplomacy could still prevail in what British Prime Minister Boris Johnson called Europe's biggest security crisis for decades.
