You can choose what that point is, but it's weird not to expect enemies to continually test where your line is, and walk you right up to it.
I'm not sure what you expect to see here?
Let's assume for a second armed conflict is the "natural" next step.
Either you are willing to get into an armed conflict over it or not. If you aren't, and they are willing to accept everything other than armed conflict (sanctions, etc), why should they care at all what you think or do? They already know you won't escalate past a certain point. As long as they are willing to accept how far you are willing to escalate, ....
In the end, people monitor actions, not words.
You edged them during your whole cold war thing & now you got a headache and want the neighbours to take care of it.
I'm totally unsure why this is directed at me.
But, at some point there is a limit. If the EU does choose, as you call it, kinetic war, Russia will be toast. They cannot win a conventional war against a far larger economy. Just like Ukraine cannot win the war against Russia.
Also increase Sanctions even more. We still have Banks like the Austrian Raiffeisenkasse that operate in Russia.