Iran's agreement over the weekend to hold a new round of nuclear talks next month with the United States and five other powers is a constructive development. On Monday, Iran's foreign minister, Ali Akbar Salehi, said Tehran is ready to resolve its nuclear disputes “quickly and easily” and suggested flexibility on uranium enrichment.But nothing is ever quick and easy with the Iranians. They are masters at diplomatic sleight of hand and have provided ample reason for mistrust. Resolving concerns about the country's nuclear activities — a source of international alarm since the once-covert program was first exposed in 2002 — remains a long shot. The actual results of the weekend talks in Istanbul were very modest. The major powers also need to confront Iran's divided leadership by spelling out explicitly a vision for the kinds of diplomatic and economic incentives that Tehran would gain if it gives up its weapons-related nuclear activities. — Excerpts from The New York Times editorial __