United Nations, United States - Nuclear powers join non-nuclear nations on Monday to launch a conference on non-proliferation, buoyed by the Iran deal but alarmed by slow-moving US-Russian disarmament.
US Secretary of State John Kerry will address the conference that reviews the nuclear Non-Proliferation Treaty (NPT) and he may meet on the sidelines to discuss the hard-fought Iran deal with Foreign Minister Mohammad Javad Zarif.
Work on the framework Iran agreement must be completed by June 30 but it is already earning praise as a potential happy ending to one of the world's most vexing nuclear disputes.
Despite applause for the Iran deal, delegates from more than 150 countries are heading into the month-long conference with a sense of gloom over the lack of progress on disarmament and the deadlocked plan for a nuclear weapons-free zone for the Middle East.
The United States and Russia have made little headway in cutting their nuclear stockpiles since 2011, and the crisis over Ukraine is stoking distrust, dimming prospects for future cooperation.
"We have a stalling in the path to a nuclear-free world," Angela Kane, the UN high representative for disarmament affairs, said ahead of the gathering at UN headquarters in New York.
Former Australian foreign minister Gareth Evans, who chaired the international commission on the NPT, described the state of play as "one of paralysis, of minimal forward-movement and of backsliding."
AFP