Ukraine's military intelligence agency (HUR) has gained access to sensitive data of Russia's strategic aircraft manufacturer Tupolev, a source in HUR told the Kyiv Independent on June 4.

Tupolev, a Soviet-era aerospace firm now fully integrated into Russia's defense-industrial complex, has been under international sanctions since 2022 for its role in Russia's war against Ukraine.

Its bombers have been widely used to launch long-range cruise missiles against Ukrainian cities and infrastructure.

According to the source, HUR's cyber corps accessed over 4.4 gigabytes (GB) of internal data, including official correspondence, personnel files, home addresses, resumes, purchase records, and closed meeting minutes.

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

The intelligence includes detailed information about engineers and staff responsible for maintaining Russia's strategic bombers, such as the Tu-95 and Tu-160, which form a key part of Russia's nuclear triad.

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

Ukrainian cyber operatives also replaced the Tupolev website's homepage with an image of an owl clutching a Russian aircraft, likely referencing HUR's insignia and cyber warfare skills.

The breach comes days after the Security Service of Ukraine (SBU) crippled over a third of Russia's strategic bomber fleet in a major drone operation codenamed Spiderweb, which targeted four Russian air bases.

That attack reportedly damaged 41 aircraft, including Tu-95 and Tu-22M3 bombers, using drones launched from trucks hidden deep inside Russian territory.

The Kyiv Independent could not independently verify the number of aircraft reportedly hit by the SBU or some of the claims regarding the cyberattack.

The source shared excerpts of internal data obtained during the breach, including what appeared to be internal documents and personnel files of staff, as proof.

The combination of physical strikes on Russia's strategic aviation and now the exposure of its internal architecture marks a significant blow to Moscow's long-range aerial warfare.

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Russian-linked hackers targeted U.K. Defense Ministry staff in an espionage operation while posing as journalists, Sky News reported on May 29, citing the British government.

The cyber attack was detected and thwarted, the government said.

Speaking to reporters at a government facility where a team had disrupted the Russian-backed operation, U.K. Defense Minister John Healey revealed the formation of a new cyber command tasked with managing both offensive and defensive cyber efforts.

"The nature of warfare is changing," Healey said, according to Sky News. "The keyboard is now a weapon of war and we are responding to that."

Western officials have warned about surging cases of Russian-linked cyberattacks and other hybrid operations, primarily targeting countres backing Ukraine against Russian aggression.

Earlier this month, London accused Russia's military intelligence (GRU) of a cyber campaign targeting Western logistics and technology organizations involved in delivering foreign assistance to Ukraine.

Similarly, the French Foreign Ministry accused a GRU-linked hacker unit of escalating cyberattacks against French ministries.

Both Ukraine and Russia have also employed cyberwafare as part of the full-scale war, targeting state institutions and companies providing critical services. The U.K. is part of the intarnational IT Coalition supporting Ukrainian cybercapabilities.

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