Although Kremlin strike planners probably didn’t intend to hit a NATO member, Romania’s military launched F-16s fighters and said it would investigate.

A Russian kamikaze drone on Wednesday flew into NATO air space and detonated near a Romanian village, Ukrainian news reports said, but official Bucharest said the fact of the strike wasn’t confirmed and that they would check.

Ukrainian social media video recorded in the river port city of Izmail, opposite Plaura, showed an orange flash lighting up the night horizon and a booming blast on the Romanian side of the river. Flames and smoke reaching hundreds of meters into the sky were visible following the explosion. A Russian kamikaze drone strike against Izmail had been in progress at the time.