冷戦時代に米国が研究目的で日本に供与した高純度のプルトニウム239（兵器級)の331キロについて、米国と返還交渉をしていることを日本の外務省等が認めました。濃縮ウランは1990年代後半に既に米国に返還済み。ジェーンズ・ディフェンス・ウィークリーに記事を書きました。
Japan discusses return of US plutonium
Kosuke Takahashi, Tokyo - IHS Jane's Defence Weekly
19 February 2014
The Japanese Ministry of Foreign Affairs has confirmed that Japan is in talks with the United States over the return of 331 kg of weapons-grade plutonium supplied to Tokyo for research purposes during the Cold War era.
The negotiations are getting under way as the administration of US President Barack Obama aims to strengthen global nuclear security to reduce the danger of nuclear terrorism, a foreign ministry spokesman told IHS Jane's on 18 February.
"Japan itself is also placing importance on security of nuclear materials," said the spokesman. "To contribute to the strengthening of international nuclear security, we are co-operating with US efforts."
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