It depends, really.
Anyone who sells to my enemies is my enemy. You yourself can be subject to embargoes.
Francesca Albanese cannot do banking with banks from her own country because the US said so. Read: third parties that have relations with the US are barred from doing business with you or else risk being blacklisted too.
https://english.elpais.com/international/2025-12-28/the-comp...