..The transaction was automatically routed through the US, possibly because of the USD currency used in the transaction, which is how the United States was able to seize the funds.." [0]
Also: "The U.S. Office of Foreign Asset Control (OFAC) enforces U.S. economic sanctions programs ... and any person or entity physically located in the United States (including branches of foreign corporations)" [2]. And most foreign banks do have US branches. And if transaction is in US Dollars, OFAC applies too [1]. I can dig deeper, down the rabbit hole :)
All right. Seems like if a transaction involves USD, it must pass US based correspondent bank.
Yes, It was noted in this thread few times. I'm talking about all other transfers, not EU-EU. Even then, the wikipedia link shows that one EU-EU transaction which involved USD, was affected.