BRUSSELS/MOSCOW, Feb 10 (Reuters) - Britain said on Thursday the West could face the "most dangerous moment" in its standoff with Moscow in the next few days, as Russia held military exercises in Belarus and the Black Sea following its troop buildup near Ukraine.
Tensions remained high, with Ukraine also staging war games, 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.
In a new round of diplomacy, Britain's foreign minister held talks in Russia, Johnson visited NATO headquarters in Brussels and officials from Russia, Ukraine, Germany and France were due to meet in Berlin to discuss fighting between government forces and pro-Russia separatists in eastern Ukraine since 2014.
Russia, which has more than 100,000 troops near Ukraine's borders, denies Western accusations that it may be planning to invade its former Soviet neighbour though it says it could take unspecified "military-technical" action unless demands are met.