Those are not necessarily Russian agents or native Russians at all. Russia uses Telegram to attract one-and-done saboteurs who execute such strikes for money.

Thanks for adding that, UkraineWarReport was calling for sending all the Russians back, which I'm convinced is bot accounts as it is of course exactly the sort of racial tension they like to see in Europe. Luckily many pointed out why that was a dumb idea. 

I'm going to add even further: a LOT of the currently pending cases where the perp was arrested, were Ukrainian nationals if you've been following European news (not in German, those don't write the nationality). I have not seen a single one involving Russians (I'm not counting the weird murder case with baby theft, that's awful but not terrorism). 

The Ukrainians took the "jobs" via telegram and thought, or so they claim, that they were regular ones from organized crime (gee that makes it so much better!). That might be true, or they might be saying that specifically to avoid terrorism charges instead of arson charges. Also the stabbing attack in Amsterdam suspect was a Ukrainian deserter who specifically wanted to go to jail in western Europe so he didn't have to go back to the army. With millions of Ukrainians in Europe, it is obvious that we would import some criminals too.