The combined GDP of NATO member states significantly dwarfs Russia's GDP, with NATO's being roughly 24.5 times larger

Remember the Golden Rule: Whoever has the gold, makes the rules.

Supporting Ukraine is hardly a dent in the economies of NATO nations, but the Ukraine war is soaking up somewhere around 40% of Russian GDP. If NATO were losing soldiers, that might become an issue, but even Putin is not damned fool enough to attack NATO.