Following a daring drone attack on Russian airfields, Ukrainian military intelligence has reportedly also hacked the servers of Tupolev, the Kremlin's strategic bomber maker.

Local media reports that the Defense Intelligence of Ukraine managed to exfiltrate over 4.4GB of data from Tupolev's servers, including official correspondence, personal data of employees, engineer résumés, purchase records, residential addresses, and minutes from closed-door meetings.

"The significance of the data obtained cannot be overestimated. Now, in fact, there is nothing secret left in Tupolev's activities for Ukrainian intelligence," a source told Interfax.

"In particular, we have obtained comprehensive information about individuals directly involved in servicing Russian strategic aviation. The result will obviously be noticeable both on the ground and in the sky."

In addition to apparently stealing data, the attackers defaced the Russian aircraft builder's website. The Defense Intelligence agency's logo is an owl holding a dagger in its claws, and visitors to the Russian site saw an owl clutching a bomber instead. The website now redirects to the United Aircraft Corporation (UAC) page instead, a conglomerate of aircraft manufacturers that includes Tupolev.