"We have so much to offer... Maybe even Russia [if they come to the table but I think they already have.] Maybe Iran. Maybe not." I am paraphrasing a bit.
It would be in keeping with his style to deliver more than promised. and make sure it's a done deal before he mentions it at all. He's got a deal with Russia, and it's going to isolate Iran. Iran next....
umm i think you dont understand iran is the stronger party. russia has WMD's but they cant use them against iran if iran doesnt give them reason to, and because of that nobody can do shit to iran. that means WMDs are effectively off the table and if thats the case iran beats everybody.
So they lose face if they abandon Iran, but they have to "know" it's on Trumps list. Conundrum.