What Chances of Drone Bombings or Other Sabotage in Red Square on May 9th?

Let’s start brainstorming — leave ideas in comments.

The least we can do is techno sabotage: shut down or disrupt whatever can be shut down anywhere in Russia, especially in Moscow. If the Russians were able to cut the flow of car fuel from central-southern U$ to the East Coast, surely some computer wizards can drop a few surprises on the Kremlin as a thank you gesture in return.