Would a theoretical insterspecies trade be sanctions proof due to medium or market size?

With all of this alien talk these days (I'll keep my personal opinion for my myself) I was wondering:

1st: If an alien species arrived one day and decided they wanted to buy 10 billion units of something (clothing or whatever else) from a country that has been sanctioned by the US (reserve currency and all that crap), could the US even do anything? I mean, even earthly sanctions are ignored or bypassed in some stances, would any of the sides (sanctioned country or aliens) even care? What would be the ripple effects for both trading country and the rest of the world if they didn't?

2nd: An alien species wants to buy 10 billions units of a Nintendo console or some Japanese car but doesn't wanna pay in westerner currencies and instead wants to pay in North Korea's currency, would Japan accept? Wouldn't a 10 billion single market matter infinitely more than US sanctions and ideological/historical grievances? And like before, what would be the ripple effects for North Korea, Japan and rest of the world?

I want focus primary on the economical-only aspect of it and the political ones takes secondary priority.