Ukraine is facing allegations that its first loss of an F-16 may have involved friendly fire with a Patriot missile battery, though its armed forces haven't confirmed those reports.
It's still unclear exactly what caused the crash , which killed the Ukrainian Air Force pilot Oleksiy Mes and was reported by Kyiv on Thursday.
Ukraine said the pilot, a 30-year-old lieutenant colonel, was killed in combat on August 26 and had downed three cruise missiles and one attack drone before his death. Mes was posthumously promoted to the rank of Colonel.
The crash is still being investigated, but The Telegraph reported on Saturday that early findings suggest the aircraft was shot down by a US-provided Patriot missile battery.