"until Ukraine had *repaid* all American wartime #aid"
In any other circumstance, I would not imagine anyone agreeing to 'repay' anything (with Interest) - given by someone else in charge - for the period when that money previously had no strings attached. Future aid, maybe, but anything given before a new agreement, no.
But Trump is the sort of person who would see someone else give a gift, and months later ask why the recipient hadn't paid him for it.