The risk is not getting involved. NATO is first and foremost a deterrent, destroying the credibility of that deterrent would destroy the rationale for NATO. To

The risk is not getting involved. NATO is first and foremost a deterrent, destroying the credibility of that deterrent would destroy the rationale for NATO. To say nothing of the fact that it'd just be an invite to Russia to invade more countries. The seeds of WWII were sown by the appeasement of Hitler, which merely emboldened him.