Europe may tighten sanctions, or they may not. One thing they won't do is get into a shooting war with Russia. Neither will the US. Why? Because due to these actions, Finland and the rest of the countries neighbouring Russia are going to join NATO. So we'll be making serious strategic gains against Russia, while harming their economy and thus ability to project power, in exchange for Ukraine losing territory that by-and-large doesn't even want to be part of Ukraine anyways.
I do love how you Cold War keyboard commandos are so eager to compare this to WWII though.