

Possibly, but unlikely. There is a more likely scenario:
If the Russia wins in Ukraine and manages to take over the whole country, it will be emboldened and will attack another country quite soon. Maybe we will let the Russia have that country as well, after which the Russia will attack once another country. Each time it will be more experienced and stronger. At some point we’ll decide we have to stop the Russia, and then we’re likely to have WW3.
Putin is a master of bluff. But a funny thing is that that’s the only thing he’s good at. And that’s the only thing he does. Which means that we know that everything he ever claims is always bluff. He is very afraid of taking actual decisions, and any red lines he claims to have are all just bluff. He won’t react to anything.
The only way to escalate with the Russia is to be inactive. The more inactivity you show, the more the Russia feels safe to attack. The more activity you show against the Russia, the less it dares to act.
If there will be a serious large-scale attack directly against EU as a whole, the politic will will appear.