[mturmon]

Or, to widen the possibilities somewhat, by Cuban interests who would prefer to not have normalized relations with the US, and who could enlist technically-advanced outside help — perhaps from Russia, but not necessarily the Russian government, directly.

One reason a Cuban entity might not want normalization is that a lot of property was taken over during the Revolution, and US Cubans (and other former property owners) have been clear about wanting it back.

Basic background: https://www.panoramas.pitt.edu/news-and-politics/property-ri...