UN nuclear chief Rafael Grossi said he discussed the safety of Russia’s Kursk nuclear plant with Ukrainian President Volodymyr Zelensky on Tuesday, four weeks after Ukraine launched its unprecedented cross-border incursion. Ukraine sent thousands of troops into the Kursk region on Aug. 6, triggering fighting less than 50 kilometers (30 miles) away from the nuclear plant. Grossi, the head of the International Atomic Energy Agency (IAEA), visited the plant last week, warning that its proximity to ongoing fighting in the Kursk region was “extremely serious.” Traveling to Ukraine this week, Grossi…