If you were to properly examine the amount European nations spend on defence equipment that they buy from the USA, you might reevaluate just how much of a "free ride" they are getting. While the USA does spend more as a %age of GDP, very, very little procurement spend is outside the USA. Similarly, Trump's touted $350B of aid to Ukraine is also totally misleading as much of that was spent buying equipment and munitions from USA Companies thus staying within the US economy and, with corporate and personal taxes, a significant sum will have flowed back into the US Treasury. Sure there is a net cost - just nowhere near £350B. Add to that, some of the European aid given to Ukraine will have been spent on buying US munitions.
Mutual defence and alliance is not a zero sum game; the benefits far outweigh the costs. Just because this conflict is In Eurpe does not mean that the USA is immune from any fallout.
When your friends come asking for help, blackmailing them to give you half their assets in return for that help is below sickeing.
PH