The main means of destruction were FPV drones launched from trucks that approached the airfields. The SBU announced the destruction of more than 40 aircraft. The destruction of 7
aircraft was confirmed, 6 of which were strategic, which were used for strikes on the territory of Ukraine
..... "An operation by Ukraine's Security Service (SBU) using first-person-view (FPV) drones smuggled deep inside Russian and hidden inside trucks has hit 41 Russian heavy bombers at four airfields across the country, a source in the agency told the Kyiv Independent on June 1.
The operation — codenamed "Spider web" and a year-and-a-half in the planning — appears to have dealt a major blow to the aircraft Moscow uses to launch long-range missile attacks on Ukraine's cities.
"The SBU first transported FPV drones to Russia, and later, on the territory of the Russian Federation, the drones were hidden under the roofs of mobile wooden cabins, already placed on trucks," the source said.
"At the right moment, the roofs of the cabins were opened remotely, and the drones flew to hit Russian bombers.""