Annoying Orange has said that he might not intervene if a NATO member is attacked. This is flagrantly against Article 5 of the North Atlantic Treaty, stating that "an attack against one Ally is considered as an attack against all Allies." When we went into Iraq and Afghanistan, NATO followed.
What if Russia goes after Latvia and Estonia?
If we don't intervene, NATO is proven worthless and dissolves.
Russia would be overjoyed at the prospect of that happening.