I'm back in ladiv, ukraine, the white house says u.s. president joe biden agreed in principle to summit with the president putin on ukraine. the french summit represents a last-ditch effort at diplomacy as the military crisis intensifies but white house warns the meeting can only take place if russia doesn't invade ukraine in the interim and would also only occur after u.s. secretary of state antony blinken and russian foreign minister sergey lavrov meet on thursday, all of this happening as new satellite images show increased activity among forces masked near ukraine's northeastern border and...