with eu foreign ministers virtually today and brief him on his meetings with russia's foreign minister. ahead of that, u.s.'s top diplomat issued this warning. >> if a single additional russian force goes into ukraine in an aggressive way, as i said, that would trigger a swift, aer is vee and a united response from us and from europe. and, again, there are other things that russia could do that fall short of actually sending additional forces into ukraine. again, across the board we're prepared with europe for a swift and calibrated and very united response. we're looking at every single scenario, preparing for every single one. >> meantime, russia was lashing out at the uk foreign office one day after it said moscow may be considering a pro-russian politician as a candidate to lead ukraine. the russian embassy in the uk called that idea comic cal and