Why would Moldova change your calculus? Not a NATO country. Why would Finland change your calculus? Not a NATO country.
Or is your assertion that only Ukraine is so useless and backwater as to not warrant a response? AFTER, may I remind you, signed security agreements with the US in exchange for their nukes.
If this is what a US security agreement buys a country, we're at a real disadvantage in any diplomatic efforts to counter China or Russia in the future.