operation to have an excuse to go in. every indication we have is they are prepared to go into ukraine, attack ukraine. >> is your sense that this is going to happen -- >> yes. my sense this will happen within the next several days. >> the president's comments came after kyiv said a kindergarten school in eastern ukraine was shelled with heavy artillery weapons by moscow-backed separatists while the separatists accused the ukrainian army of firing on the tear toe they control. nbc news could not confirm the details of the incidents. russia expelled the deputy chief of mission at the u.s. embassy in moscow. the state department has the move was unprovoked and an escalatory step. this as the u.s. finally received russia's written response to its security proposals for deescalation. moscow's response is the u.s. refused to meet the core security commands and rea farms