Oil prices climbed sharply on Wednesday after US President Donald Trump ordered “a total and complete” blockade of all sanctioned oil tankers entering and leaving Venezuela, raising fresh geopolitical tensions at a time of concerns over demand. Brent crude futures were up 53 cents, or 0.9% at $59.46 a barrel at 0105 GMT, while US West Texas Intermediate crude rose 55 cents, up 1%, to $55.82 a b