"At the right moment, the roofs of the cabins were opened remotely, and the drones flew to hit Russian bombers.".
The source said one of the airfields hit was the Belaya air base in Russia's Irkutsk Oblast, more than 4,000 kilometers from Ukraine.
Olenya air base in Russia's Murmansk Oblast, the Diaghilev airbase in Ryazan Oblast, Ivanovo airbase in Ivanovo Oblast were also targeted.
"Currently, more than 40 aircraft are known to have been hit, including the A-50, Tu-95 and Tu-22 M3," the source added.
The SBU later reported that the drone operation caused approximately $7 billion in damages and disabled 34% of cruise missile carriers in key Russian airbases.
A video provided by the source shows what appears to be a row of heavy bomber aircraft on fire at one of the airbases.
The drone launch and airbase hit were over 4000 km (2500 mi) from Ukraine. pic.twitter.com/XU7bCzV5QJ — OSINTtechnical (@Osinttechnical) June 1, 2025. »