Global powers dealing with Iran’s nuclear program said Tuesday that they have agreed to resume talks, which Iran proposed in a letter last month. Catherine Ashton, the European Union’s foreign-policy chief, said she responded to the letter, opening the door for talks to resume after they were broken off more than a year ago. Nations involved include the five permanent members of the U.N. Security Council—the U.S., Britain, France, China, and Russia—as well as Germany. Western powers suspect that Iran is trying to build nuclear weapons, but the country denies the charge. Iran also agreed to allow inspections of its nuclear sites.