Russian threats against Ukraine are only serving to strengthen the commitment of NATO allies to stand ready to support one another, argues British Prime Minister Boris Johnson. “If [Russian] President [Vladimir] Putin believes that, by these actions, he can drive NATO back, he will find that the opposite is the case,” Johnson said at the Munich Security Conference, referring to worries that Russia is preparing to attack Ukraine, which Moscow denies. “This experience, terrible as it is, might do even more to unify the continent,” said Johnson, arguing that an attack on Ukraine would result in h…