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Of Soviet KGB. That's the credit I should give to them. They demonstrated their capacity to penetrate Russian defenses so deep. But this is not a military operation. Ukraine military were not involved. I don't believe General Syrskyi even knew it. It's also true in U.S.
This kind of clandestine operations are conducted by CIA, NSA, FBI, and other intelligence agencies, not the Joint Chiefs of Staff.

It's a sabotage operation that exploited a vulnerability of Russia side which came from the agreement with U.S., Strategic Arms Reduction Treaty (START) which requires strategic nuclear capable bombers to remain visible to satellites of both US and Russia. No hangars for them.

What about Ukrainian military operation? They keeps retreating on the battlefield. They're losing territories in all directions. That's the reality.