as we wait to talk to our correspondents, it is about putin putting down his leverage, trying to outflank the united states. >> the addresses will include major speeches. our commentatorcommentators, th some of them, are standing by to break it down. there's a lot to coverage over the next several hours. we'll begin our coverage with jim sciutto, our chief national correspondent. >> we'll see so many of the foreign policy challenges facing the u.s. and the world confronted on this stage at the u.n. issues in ukraine, in syria, climate change, u.s. relations with cuba, and the president speaking today to many of the issues. he'll start with climate change, a new agreement with china, coming from their state visit this past week. russia's intervention in ukraine. recent development upcoming, concerning many u.s. officials. russia's intervention in syria,