(LONDON) — An analysis by multiple experts of new video and satellite images suggests that at least 11 Russian bomber aircraft and one large transport plane were badly damaged or destroyed in Ukraine’s drone attack on Sunday.

Video released on Wednesday by the Security Service of Ukraine (SBU) gives more details on the attack, the full extent of which has been unclear.

Ukraine’s government said over 40 aircraft were destroyed in an attack on at least four air bases on Monday.

On Wednesday, two United States officials said around 10 planes had been destroyed and a total of around 20 were targeted in the attack.

The video from the SBU released Wednesday opens with a view of the Olenya air base with multiple drones landing on Tu-95 and Tu-22 bombers and an An-12 transport plane. Explosion

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