Most nations have accounts at the federal reserve. If the crediting is to be in dollars they can just credit or deduct their account balance.
Note that most money today is just database (book keeping) entries. Nobody sends chunks of money in ships or airplanes. Note also that money doesn’t even exist even if someone wanted to send it.
Finally and most importantly that’s also the mechanism by which the nation who serves this intermediary function gets to rule its doctrine over other nations. See sanctions US imposes on other nations.
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