The Trump administration’s indictment of former Cuban president Raul Castro and sanctions on his successor, Miguel Diaz-Canel, suggest Washington now views regime change in Havana as a viable policy objective. This adds to Cuba’s mounting woes. The fall of Venezuela’s Nicolas Maduro in January severed the subsidised oil lifeline that had long kept the island nation afloat, plunging Cuba into its worst socio-economic crisis since the 1990s. For most countries, this is a distant problem. For...