Japan signed an agreement to hand over nuclear material to the US

Japan and the United States on 24 March 2014 signed an agreement for removal of 315 kilograms of weapon-grade Plutonium and Highly Enriched Uranium (HEU) to United States. As per the deal, the fissile material would be transported from Fast Critical Assembly (FCA) at the Japan Atomic Energy Agency (JAEA) to a secure facility in the United States.

This deal was reached between the two nations during the 2014 International Nuclear security summit in The Hague, Netherlands.
 
This deal of providing the highly enriched uranium and plutonium to US can be considered as Japanese effort to prevent proliferation and abuse of nuclear material by terrorists, which is the background of the nuclear summit. One of the main aims of the summit is to reduce the amount of dangerous nuclear material in the world that terrorists could use to make a nuclear weapon (highly enriched uranium and plutonium).

Background
Japan in 1960s purchased the fuel from the US, which was used by Japan Atomic Energy Agency for research purposes. The amount of plutonium holdings of Japan that will be transferred to US is a fraction of Japan’s overall holdings.

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