The minister says the situation in Cuba is "extremely tense", as a US-led blockade of oil to the country causes widespread power cuts. In an interview with state-run media, de la O Levy said there were limited amounts of gas available, but that Cuba's energy system was in a "critical" state as a US-led blockade of oil to the country squeezed supply. The US this week reiterated its o... [1196 chars]