International Panel on Fissile Materials has released Global Fissile Material Report 2013: Increasing Transparency of Nuclear Warhead and Fissile Material Stocks as a Step toward Disarmament (PDF). This is the seventh Global Fissile Material Report. The focus of this report is increasing transparency of nuclear warhead and fissile material stockpiles. Under the terms of the 2010 "Action Plan on Nuclear Disarmament," the NPT nuclear weapon states agreed to cooperate on steps to increase transparency and develop verification capabilities related to nuclear disarmament and in particular to report information that can further openness and verification. The nuclear weapon states are expected to report to the NPT Preparatory Committee in 2014 on progress towards meeting these obligations.

The report begins with an overview of current nuclear weapon stocks and of national holdings of fissile materials and then lays out a set of options for a series of increasingly detailed public declarations by nuclear weapon states of their nuclear warhead inventories, and of their production and disposition of highly enriched uranium and separated plutonium, the fissile materials that are essential in nuclear weapons. It also suggests new cooperative projects that could assist in the eventual verification of such declarations. The declarations proposed in this report could fulfill some of the nuclear weapon state obligations under the "Action Plan on Nuclear Disarmament" and would provide essential background information required for the negotiation and verification of deep reductions in nuclear arsenals and for the eventual elimination of nuclear weapons. Contributors include Randy Rydell, Hans Kristensen, Robert S. Norris,  Peter Dessaules, Fred McGoldrick, and James Fuller.

The report was formally launched on 22 October 2013 at the United Nations at an event sponsored by  the Permanent Mission of Japan (the slides for the event).