NEW : But French President Nicolas Sarkozy and President Dmitry Medvedev of Russia both have said they back Lula 's efforts to resolve the long-running , high-stakes stalemate . President Erdogan says deal possible on nuclear technology swap with Iran . Russian President Medvedev says talks are ` ` last chance '' to resolve nuclear issue . U.N. Security Council decision imminent on possible sanctions against Ms . Lula in Iran ahead of summit of 15 nuclear nations meeting in Tehran .
NEW : President Erdogan says deal possible on nuclear technology swap with Iran . Russian President Medvedev says talks are ` ` last chance '' to resolve nuclear issue . U.N. Security Council decision imminent on possible sanctions against Ms . Lula in Iran ahead of summit of 15 nuclear nations meeting in Tehran .