There's also the whole other issue thsat the US, when a country refuses to trade with them because they want to impose unfair conditions....the US has often resorted to then imposing trade bans on countries who still trade with the country who refused to trade with them.
Such is the case even to a small level. The band "Manic Street Preachers" were told at one point that they were no longer allowed to tour in the US because they played a gig in Cuba.