. >> and i'm philip mena. >>> cold war-era mentions heating back up this morning. president trump is threatening to pull out of a landmark nuclear arms agreement negotiated decades ago with russia. >> now national security adviser john bolton will kick off two days of high-stakes talks in moscow this morning to try and find common ground. nbc's tracie potts joins us from washington. good morning, tracie. >> reporter: hi, marlie and philip. good morning. good morning, everyone. you're right, it was more than 30 years ago that presidents reagan and gorbachev signed that inf treaty that bans missiles that could travel 3,500 miles or more. in other words, from one side of the world to the other. but now, president trump says that russia has violated that deal, so he wants to pull out, and he sent his national security adviser to moscow to send that message over the next two days. >> russia has violated the agreement. ers not going to let them violate a nuclear agreement and go out and do weapons, and we're not allowed to, so we're going to terminate the agreement. we'r