The world is "closer than ever" to reaching a comprehensive nuclear deal with Iran but the work is far from over, with key issues unresolved, Secretary of State John Kerry on Monday told a global gathering on nuclear disarmament, where he and Iran's foreign minister met on the sidelines. Several of the world's nuclear powers over the month ahead will discuss progress on a landmark treaty on disarmament, with Israel attending for the first time in two decades as an observer. Diplomats said the ongoing Iran discussions are separate from the Nuclear Nonproliferation Treaty, or NPT, review conference, which is...