Just like anything else: if the belgian company doesn't comply but does any business with the US, then the US can interfere. Now this example is quite irrelevan

Just like anything else: if the belgian company doesn't comply but does any business with the US, then the US can interfere. Now this example is quite irrelevant, the interesting and usual case is a company from any other state hiring a worker remotely and residing in NY. This is straightforward.