VIENNA (Reuters) - The five permanent members of the U.N. Security Council put pressure on Iran on Thursday to allay international concern about its nuclear program, saying they expected talks with Tehran to lead to concrete steps toward a negotiated solution.

In a joint statement issued at a nuclear meeting in Vienna, the United States, France, Russia, China and Britain also urged Tehran to urgently agree with the U.N. nuclear watchdog on access to "relevant sites and information."

(Reporting by Fredrik Dahl; Editing by Janet Lawrence)