There could be interest from other foreign companies apart from the US.
Here is a list of foreign companies already doing business with Cuba:
http://www.cubabusinessreport.com/international-corporations-doing-business-in-cuba/
Note how many companies have oil interests, with agreements with China, Russia, Australia (MEO), Brazil Petrobras), Canada (Sherritt), France (Total), Mexico (Pemex), UK (Castrol), Venezuela,
Some heavy hitters in there (with the obvious exception) so take your pick I guess.
DYOR
