The next few days could be the most dangerous moment in Europe's biggest security crisis for decades as Russia stages war games in Belarus, British Prime Minister Boris Johnson said on Thursday, though he believed Moscow had not yet decided whether to invade Ukraine.
Russia, which has more than 100,000 troops at the Ukrainian border, 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.
