Companies use proxy countries to bypass sanctions all the time. You know how they're caught? Financial audits.
> change the fact that circumventing agricultural import laws is a massive crime
I'm not sure how people so easily forget that it was a massive crime to protect jews from being murdered. That same thing still happens today with various minority groups around the world.
If you pay attention to non-developed world problems, you become painfully aware that bypassing laws that are a "massive crime" is extremely important for solving some of the worst problems in humanity today.
Government will adapt and just ban shipping vessels from visiting sanctioned countries, or create a vast make work agency to inspect cargo on ships that visited sanctioned countries.
As for why everyone isn't using bitcoin to bypass? Good question.