While the world watched the pomp of Donald Trump’s trip to Beijing, the US was turning up the pressure thousands of miles away. Its oil blockade has plunged Cuba into a humanitarian crisis, sparking nationwide blackouts that have prompted rare protests, closing schools and universities and leaving hospitals battling to treat patients. Surveillance flights are circling. US media reported this weekend that federal prosecutors are preparing an indictment for Raúl Castro, the 94-year-old former president and brother of Fidel. Mr Trump has casually observed, while bragging about the kidnapping of Venezuela’s then leader Nicolás Maduro in January, that “Cuba is next”.

A military assault on Havana would be vastly more fraught for the US – even without the war on Iran – and disastrous for Cubans. Washington hopes that threats and privation will be........

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