Cuba barters with other countrys using inovative ideas, involving medical and military personel for active service, training and education. They also have maintained simple technologys that are embargo proof, like steam engines for railroads, slow ,clunky, realy realy hard to kill. Also Cuba is popular everywhere for many things,but especialy in there role as, go to communist devil, in spite of how often the label slides off and has to be furiously re applied.

There's nothing particularly innovative about selling the services of mercenaries to other dictatorships. Hopefully they'll all be killed.