A nuclear research facility in Ukraine has been damaged by Russian shelling, the International Atomic Energy Agency said. There was likely no “radiological consequence” to the facility in Kharkiv, Ukraine’s second-largest city, the U.N. nuclear watchdog said in an update late Monday. Ukraine’s national nuclear regulator told the IAEA that the incident did not cause…

TOKYO—A team from the U.N. nuclear agency arrived in Japan on Monday to assess preparations for the release into the ocean of treated radioactive water from the wrecked Fukushima nuclear plant. The six experts on the team from the International Atomic Energy Agency are to meet with Japanese officials and visit the Fukushima Daiichi plant…

VIENNA/SEOUL—North Korea appears to have restarted a nuclear reactor that is widely believed to have produced plutonium for nuclear weapons, the U.N. atomic watchdog said in an annual report, highlighting the isolated nation’s efforts to expand its arsenal. The signs of operation at the five-megawatt (MW) reactor, which is seen as capable of producing weapons-grade…

VIENNA/DUBAI—Iran and the International Atomic Energy Agency (IAEA) are extending a recently expired monitoring agreement by a month, both sides said on Monday, avoiding a collapse that could have pitched wider talks on reviving the 2015 Iran nuclear deal into crisis. The move gives breathing space to indirect negotiations between the United States and Iran…

TEHRAN, Iran—The head of the United Nations’ nuclear watchdog met with Iranian officials on Feb. 21 in a bid to preserve his inspectors’ ability to monitor Tehran’s atomic program, even as authorities said they planned to cut off surveillance cameras at those sites. Rafael Grossi’s arrival in Tehran comes as Iran tries to pressure Europe…

TEHRAN, Iran—The head of the United Nations’ nuclear watchdog met Sunday with Iranian officials in a bid to preserve his inspectors’ ability to monitor Tehran’s atomic program, even as authorities said they planned to cut off surveillance cameras at those sites. Rafael Grossi’s arrival in Tehran comes as Iran tries to pressure Europe and the…