The drone strikes on Russian air force bases weaken Moscow’s ability to wage war on its neighbor and undermine its capacity to threaten more distant rivals.

Russia’s Defense Ministry in a statement confirmed the attacks, saying they damaged aircraft and sparked fires on air bases in the Irkutsk region, as well as the Murmansk region in the north. It said strikes were also repelled in the Amur region in Russia’s Far East and in the western regions of Ivanovo and Ryazan, the ministry said.

A surprise Ukrainian drone attack that targeted several Russian air bases hosting nuclear-capable strategic bombers was unprecedented in its scope and sophistication for the first time reached as far as Siberia in a heavy blow to the Russian military.