Not quite sure what else you can do though - can't uninvent nuclear weapons sadly.
But seriously though, if Russia wanted to steamroll Eastern Europe, they have Nuclear capability. The issue then becomes one of :
1. Do we let them steamroll us and go down without a fight to avoid Nukes being used;
Or
2. Do we fight militarily and risk it escalating to nukes (as Putin loves escalation)?
If we use military versus their military, Russia will undoubtedly exhibit the same lack of appreciation for human life as they've done in history, and will just let thousands die needlessly. Perhaps even to the point where they will throw some troops at NATO/UN, test their stance, then bring out the big guns.
Fact is, Russia is huge, and to tactically target each area would be impossible with the current prevalence of western nukes. Whereas just 2-3 nukes could take out pretty much every none-US country in EU.