Cuba lies more than 100 kilometres from the nearest slice of the continental United States, but it has managed to keep a close eye on what Uncle Sam is up to for a very long time. That's because it has repeatedly been able to find high-flying American sources who are willing to spill U.S. secrets to Havana — for years, or even decades. They include Ana Belén Montes, the U.S. Defence Intelligence Agency analyst who passed secret information on to her Cuban handlers from the mid-1980s through to t