china has dispatched representatives to the u.n. in new york to hash this out. president obama expressed confidence that china will come on board, but cautioned that even tougher sanctions aimed at curtailing iran s nuclear appetite won t produce immediate results. sanctions aren t a magic wand. what sanctions do accomplish is hopefully to change the calculus of a country like iran so that they see that there are more costs and fewer benefits to pursuing a nuclear weapons program. reporter: now in describing the strategy going into this two-day summit, a senior administration official said that they use this gathering shamelessly to try to get some of these countries to show up with, quote, house gifts, in other words, come here with some kind of commitments. well, the u.s. did get commitments. they have the handshakes. but again, the big question is whether or not those handshakes and commitments will turn into real action starting tomorrow.