What is the reason that the Ukraine feels owed the money to rebuild?
It is because they fight at the behest of USA.
there is something of a ‘national personality’ impression from all of this, though.
with UKR, I imagine a scolding nation, in varying degrees of profanity demanding other countries subsidize them to unlimited degree, and becoming profane and hysterical when rejected (often putting the sources of such rejections or unflattering comments on a kill-list).
these folks are psychotic. they actually put Musk (who provides their internet services..) on such a list. Multiple US journalists have found their way there as well.