Russian air defense forces shot down one of their own most advanced combat planes over the southern Ukrainian city of Tokmak in late September

The incident involved a Su-35S “Flanker M” multirole fighter jet

This incident took place over the occupied city of Tokmak, in Zaporizhzhia, Ukraine. The Su-35 is one of Russia’s most modern warplanes, and very few have been taken out 

The British Defense Ministry has said that it had 80 to 90 percent confidence that an Su-35S was destroyed in the incident