unable to regain control. russia's foreign minister is threatening to back out of an in the national conference in geneva on thursday to. day, u.n. secretary-general moon spoke with putin and urged him to de-escalate this actions. president obama and putin spoke yesterday with the president warning there could be greater economic costs, aka sanctions. joining me kimberly martin, barnard-columbia. thank you for joining us. >> a man eminently quotable foreign minister. he said today, ukrainian officials are spreading lies. he continues to deny russia's involve. in ukraine. just how complicated is the situation by the fact that, russians refuse to acknowledge they are even there? >> everything is complicated. truth is we don't know who is there.