Ukrainian President Volodymyr Zelenskyy fired the country's air force commander Friday, four days after an F-16 warplane that Ukraine received from its Western partners crashed during a Russian bombardment and killed the pilot. U.S. experts have joined the investigation into the crash, the air force said.
https://www.pbs.org/newshour/world/zelenskyy-fires-ukraines-air-force-commander-after-f-16-pilot-dies-in-crash