our bureau chief, alexandra von nahmen miss alexandra von nahmen has been following events on capitol hill. she sent us this report. alexandra: the address to congress seems to go down well with the american congress, especially when he prays the role, calling america the backbone of the alliance. his address was to show that the alliance has been beneficial for partners on both sides of the atlantic. the fact that the u.s. has benefited from nato is something that the current u.s. president tends to forget when criticizing the alliance. brent: he is the head of the munich security conference. she asked, does nato need t to change the way it seeses itself? >> i think the future will put two nato in terms of new challengnges, how can nato deal with, react to the new role of china? what role can nato take for all nato members in managing new technologies? when we think about defense and security in the past,t, we talk about the number of tanks. in the next 10, 15, 20 years, the questionon will be no longer about the number of tanks. the question will be artificial intelligenence, resili

brent: our washington bureau chief alexandra von nahmen at the white house for us tonight.hank you. greek prime minister alexis tsipras has paid a historic first visit to his counterpart in the republic of north macedonia. that's an important point. the two neighbors are celebrating a new start after resolving a bitter, decades-long dispute that was all about a name. here is more. reporter: 21st century diplomacy at its best. two heads of state making history with a selfie. alexis tsipras is the first greek prime minister to visit the north macedonian capital. the neighboring countries were at odds for three decades. their main bone of contention? the name of the country where they are now meeting. >> it is not only an important day for us, but for the entire balkan peninsula. today we are creating an entire -- a different kind of dialogue, one which reunites our country's histories. reporter: the meeting is so important because it marks the first peaceful resolution of a conflict in the former yugoslavia, something that was not accomplished in bosnia or kosovo. the decisiv