I don't really "want" to go to war with Russia. As in, not at all.
But, if a few conditions are met, I'd support the effort.
1) Russia actively initiates military action in Ukraine
2) NATO-member European states send troops to Ukraine to oppose
3) Russia responds by attacking one or more of the NATO-member states (not their troops in Ukraine, but upon their sovereign soil)
I can pretty easily see #1 and #2 happening. #3 is a huge leap. But, if it happened, I'd support war on Russia.