Don't want to end up on the Sanctioned Entity List? Avoid anything that might make you controversial to a Federal Bureaucrat, and never do business with or on behalf of anyone already on the list. That's pretty much the only criteria to get on it. It's considered to be under the auspices of "Foreign Policy" so is under the sole discretion of the Federal Executive.
A few years ago, I'd tell you if it's a NATO ally, odds are at some point they are wired into OFAC. The choice is, do business with the American financial system, or get added to the sanctioned. There's a reason why I said the American Financial system is wired for soft power projection. We were big and trustworthy enough where just going along with it to maintain access to things made the act of checking a list that thusfar, no one had too many objections to the people who ended up getting added to it was just a no brainer.
Then... an ICC judge got sanctioned, finally making apparent how the U.S. really intended the mechanism to be used; as an "our way, or the highway" sort of thing. So I'm far from able to make any informed guesses on who is still honoring the commitment or not. The Cheeto-in-Chief has done a marvelous job at encouraging everyone to reassess the longevity or reliability of Pax Americana, sooo...
As for how to move assets out? If you aren't on the list, just move em somewhere else. Just not to anywhere on the list. If you are on the list, kiss your assets custodially held goodbye til the ole' U.S. of A decides to take you off the list, which at a minimum is probably going to require some very uncomfortable chats with people you don't want to be alone with.
Again, there is a reason I left. There is a reason I have no desire to return, and why I've basically opted to live life extra hard mode, because I can't just accept that it's okay for the Government to orchestrate financial lockout; and even less reason why we should all be gungho to implement systems like that. Canada has one, I'm pretty sure Great Britain and most of Europe each probably maintain their own as well. You'd have to check. I understand why a country would seek to have one, and operate one. I just can't consciably be involved in it. The abuse potential of the capability is too damn high. "Good guys in office who wouldn't be stupid enough to abuse such a thing" cannot be said to be a given. I wasn't comfortable with the Orange Man sitting on the nuclear football, nor am I comfortable with him on OFAC or anything else his position now entitles him too.
If I sound like a paranoid nutter, I sympathize, sounds pretty fantastic right? I once thought the same thing about a guy who used to work for the Postal Service who tried to tell me that "Oh, hell no, USPS will absolutely open main in transit for a myriad of reasons. At the time, I took it with a grain of salt. Now... I realize he was absolutely telling the truth. If it's a network, we (the U.S.) will do everything in our power to maintain the ability to tap, manipulate, and control it. I just want help machines move bits from A to B man. Not be a cog in sovereign theft/freezing of assets of the politically/diplomatically inconvenient/disfavored. Violates the Moral Imperative.
Here's the lists btw. Enjoy.
https://sanctionssearch.ofac.treas.gov/
Was really the first time in my life I started looking at and appreciating databases as the weapons they are.