Tales of Putin willing to take over Europe are straight up fearmongering. Most countries in Europe are part of NATO and subject to mutual defense clause. Ukraine is not, which us why it was possible to attack it in the first place (and which is why it desperately wants in).
Attacking any of the NATO countries is straight up suicidal.
Please do not let hysteria sift into your brain, for this is the very thing corrupt politicians use to do terrible things.