trump's aides insisting he'll be tough on putin. >> we don't recognize the annexing of crimea. in president has been really tough when he needed to be, expelling russians from our country, issuing sanctions, pushing back against president putin and others. >> reporter: even some republicans voicing their concern. >> putin is not a friend to democracy. capitalism. anti-corruption. he is not a friend of those efforts. okay? >> reporter: now, jake, european leaders have made clear that their biggest fear is that this is going to be a contentious nato summit and the president going to travel to helsinki for a friendly summit with vladimir putin. something that they fear could result in concessions like the stop of military exercises in europe or the scaling back of u.s. troops there, as well. be there's a soensen the ground here they think a new world order could happen after this trip. jake?