This is reported by Russian media.
It is noted that explosions were heard in the Russian town of Engels, near the airfield of the Russian strategic aviation. The air defense system was triggered. Eyewitnesses report that an air raid was heard before the explosions.
Earlier, explosions at the airfield of the Russian city of Engels in the Saratov region occurred on December 26. Russian forces reported three dead Russian soldiers. The Russians have redeployed some of their aviation from the Engels airfield in the Saratov region of Russia, but the airfield is still operational.
On December 29, British intelligence explained Russia's inability to defend the Engels airbase. The Russian forces moved medium-range "Pantsir" air defense systems to the front line, so the airfields in the deep rear remained unprotected.