even without methotrexate. ask about xeljanz. the u.s. is calling russia's decision to complete the sale of a sophisticated air defense missile system to iran unhelpful. but russia says president obama's deal on iran's nuclear program makes the ban that has been in place since 2010 unnecessary. correspondent doug mckelway has reaction tonight from the white house. >> reporter: in the latest unexpected speed bump that jostled the iranian nuclear talks, the russian foreign minister announced that russia is lifting its embargo and the sale of its s-300 surface-to-air missiles to iran, claiming it's no long necessary. >> translator: i want to mark that anti-missile rocket complex is of entirely defensive nature.