A fuel depot in the Russian city of Belgorod is on fire Friday after Ukrainian helicopters reportedly crossed the border and attacked the facility, the governor of the region said on social media, claims that have not been independently verified but if true would mark the first Ukrainian airstrike on Russian territory and a major embarrassment to Moscow.

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Two low-flying military helicopters conducted an airstrike on the oil depot, setting the facility ablaze and injuring two workers, regional governor Vyacheslav Gladkov said on Telegram.

Gladkov did not provide evidence for the claims and they have not yet been independently verified or claimed by Ukrainian officials.

If true, the attack would mark the first Ukrainian airstrike on Russian territory since the war began and comes after Moscow claimed to have “practically” destroyed Ukraine’s air force last week.

The reports add to growing signs of strong resistance against Russian forces, with Ukraine continuing to “make successful but limited counter attacks to the east and north east of Kyiv” and retaking two villages south of Chernihiv, according to the latest update from the British defense ministry on Friday.

Late on Thursday, the defense ministry said Russia is “redeploying elements” of forces stationed in Georgia to reinforce the invasion.

The ministry said it was “highly unlikely” Moscow planned to generate reinforcements like this, which is “indicative of the unexpected losses it has sustained during the invasion.”