KYIV, Ukraine (AP) — Security at Ukraine's Zaporizhzhia Nuclear Power Plant remains fragile amid worrying recent staff cuts enacted by Russian authorities occupying the facility, which is one of the 10 biggest atomic power plants in the world, the United Nations nuclear watchdog chief said Tuesday. International Atomic Energy Agency chief Rafael Grossi, who is in Kyiv, told The Associated Press that his upcoming visit to the plant as the war approaches its two-year milestone will aim to assess the impact of recent personnel reductions after Russia denied access to employees of Ukraine’s Energoatom. “This huge facility used to have around 12,000 staff.