VIENNA (AP) — Efforts to bring the United States back into the 2015 deal on Iran’s nuclear program are stepping up a gear. Iran and the five world powers still in the accord met in Vienna while the U.S. is due to start indirect talks with Tehran. Also due in the Austrian capital is a U.S. delegation headed by the special envoy for Iran, Rob Malley. In Tehran, a government spokesman says his country’s aim remains “lifting all sanctions that were imposed or reimposed against Iran” after the U.S. quit the deal under President Donald Trump. The accord restricted Iran’s nuclear program in return for relief from U.S. and international sanctions. However, Iran has pushed beyond the limits set by the deal.