Oil falls as Trump's Colombia sanctions threat reversed

By Anna Hirtenstein LONDON (Reuters) -Oil prices retreated on Monday after the U.S. pulled back from initial sanctions threats against Colombia, reducing immediate concern over oil supply disruptions, though U.S. President Donald Trump's muscle-flexing is keeping markets twitchy. Brent crude futures fell 60 cents, or 0.8%, to $77.90 a barrel by 1300 GMT. U.S. West Texas Intermediate crude was