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How do you prevent that they don't spread to other non russian torrents?

You don't. That's a way to punish all users of pirated software.

Thats still a crime.

You can't rob someones house even if they they are a burgler.

Can a vendor be held responsible for anything an unauthorized pirated copy of their software does?

Can a car manufacturer be held responsible for built-in features designed to maim or kill unauthorised users?

If he put the malware in, yes.