An operation by Ukraine’s Security Service (SBU) has hit “more than 40” Russian bombers at air bases “in the rear of the Russian Federation,” a source in the agency told the Kyiv Independent on June 1.

“Enemy strategic bombers are burning en masse in Russia — this is the result of a special operation by the SBU,” the source said.

Video provided by the source shows what appears to be a row of heavy bomber aircraft on fire at an undisclosed location.