(a) "The US ambassador [Joseph Macmanus] to the IAEA made clear his country was not worried about Japan's treatment of the material.
(b) "Japan's Kyodo news agency said the United States had pressed Japan to give back the nuclear material, which could be used to make up to 50 nuclear bombs. Japan had balked, but finally given in to U.S. demands, Kyodo said.
"The material was bought for research purposes during the 1960s and the two governments will probably reach an official agreement on its return at the Nuclear Security Summit in The Hague in March, an official at Japan's Education Ministry said.
(c) "IAEA Director General Yukiya AMANO 天野 之弥 [directorship 2009- ] earlier this week also said there was no reason for concern that plutonium held by Japan could be diverted for nuclear arms purposes.
Note: Kyodo News
en.wikipedia.org/wiki/Kyodo_News
(a nonprofit cooperative news agency based in Tokyo; established in 1945)