Ukrainian special services said on Wednesday that “unknown saboteurs blew up two planes and a helicopter in the Moscow region,” reports CNN.

The incident took place at the Chkalovsky Air Base, about 30 kilometers northeast of Moscow, Defense Intelligence reports.

“A group of the Investigative Committee of the Russian Federation is investigating the fact of sabotage at the Chkalovsky airfield,” he said.

“Unknown people planted explosives at the heavily guarded airfield and blew up An-148 and Il-20 aircraft (both of the 354th special purpose regiment), as well as an MI-28N helicopter, which had previously taken an active part in the downing of the drone attack over Moskovskaya region,” Defense Intelligence said.

“The damage suffered by the planes will not allow (Russia) to count on their quick repair,” he added.

On Monday, some Russian media reported a fire near the base without providing details.

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