IT HAS faced almost half a century of sanctions from the US,but last month the country claimed it could be sitting on oil reserves that surpass even those of its neighbour to the north.At a conference in Havana,Rafael Tenreyro Perez,the exploration manager for state-owned energy firm Cubapetroleo said the country's oil reserves could be more than 20bn barrels.If true,it would double previous estimates of the offshore potential.
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