UK Prime Minister Boris Johnson will make a fresh diplomatic push in the coming week as part of efforts to defuse the Ukraine crisis, his office said Sunday. The statement came after his defence minister suggested some nations were not taking a strong enough stand against Moscow, as fears grows among some western the countries that Russia is preparing to invade Ukraine. Johnson will hold talks with other world leaders, and is particularly keen to talk to the Nordic and Baltic countries, the statement from Downing Street said. “The crisis on Ukraine’s border has reached a critical juncture,” sa…