First Thing: Russians flee Chernobyl with radiation sickness, says Ukraine

UN atomic watchdog investigates claims Russian troops left after high doses of radiation. Plus, Trump may face court date thanks to reggae singer lawsuit.

Hello and good morning.

The UN atomic watchdog is investigating Ukrainian claims that Russian soldiers occupying Chernobyl nuclear power station left after receiving high doses of radiation.

What is Chernobyl? The plant is the site of the world's worst nuclear accident in 1986. Staff continue to oversee the safe storage of spent nuclear fuel and supervise the concrete-encased remains of the reactor that exploded.

When did Russia take control of Chernobyl? Russian troops seized the nuclear plant soon after the 24 February invasion. There have been concerns over the past month about power cuts and fighting making staff shift rotations difficult.

What claims is the UN agency likely to investigate? Ukraine's deputy prime minister Iryna Vereshchuk claimed Russian troops dug trenches in the forest and were exposed to radiation. Some reports suggest soldiers are being sent to a special medical facility in Belarus after driving tanks through the dead zone" around the nuclear plant, kicking up radioactive dust. (These claims are unverified.)