[glup]

Right, that's an important nuance. But that means that a firm in a country like Spain is only constrained by the embargo if it also does business with US companies, right?

[krschultz]

Which ends up being a very large number of companies, and it can generally be enforced simply through preventing banks from working with a company.

[markvdb]

Things like http://lta.reuters.com/article/idLTAL2N0PE1H520140703 .

BNP Paribas is one of the biggest French banks...