WASHINGTON—Obama administration officials said they have taken a series of steps in recent days to overcome the sticking points that tripped up an international agreement over Iran’s nuclear program and are set for new talks in the coming week. Senior U.S. officials said that after the failure of world powers to reach an accord in negotiations with Tehran earlier this month, despite high levels of confidence then, most of the problems are being addressed. These officials cited deliberations that have taken place over key issues: Iran’s demand for the right to produce its own nuclear fuel domestically; the purity levels for Iranian enrichment and the control of its stockpiles; and the future of a heavy-water reactor that could be capable of producing weapons-usable plutonium within two years. “We’re very close to a deal,” said a senior U.S. official involved in the diplomacy Friday. “We have a much clearer sense […]