Source : The Japan Times
https://www.japantimes.co.jp/news/2014/01/27/national/return-arms-grade-plutonium-u-s/#.UugNHbTjKM8 Return arms-grade plutonium : U.S.
Kyodo Jan 27, 2014
Washington has been pressing Tokyo to return over 300 kg of mostly weapons-grade plutonium given to Japan for research purposes during the Cold War era, Japanese and U.S. government sources said Sunday.
President Barack Obama’s administration, which is keen to ensure nuclear (...)