It might be more useful to track them and spread them around the EU, educate them and use the mandatory courses in civics to cause them to self-organize, recruit agents among them too. One day they will return, and Vlad can't imprison them in a gulag in today's world, better they return with fond memories and an attitude, organized and ready to recruit others, instead of being conscripted. They are up against a half million strong internal federal security force; they might be better deployed in the middle of nowhere to protect vital rail bridges and substations from destruction.
It's the same idea in America and how modern civil wars are fought, cause as much shit and chaos as possible and the government not work if you can. Create social division and internal violence, they won't get their country back from scoundrels and thieves unless they spill blood. You might not be able to keep your country and constitution for the same reasons, but things are a lot worse in Russia and will get more so soon. This is how modern civil wars are fought in industrialized societies. Sow discontent and grab power, then hang onto it by any means possible, they don't worry about elections either once they have power, they can be rigged and stolen, or you can claim they were if they weren't. The truth becomes plastic and hard to pick out with a blizzard of bullshit burying it.