Oil hits highest since mid-2015 as global producers agree to cut

By Amanda Cooper LONDON (Reuters) - Oil rose by as much as 6.5 percent on Monday to an 18-month high after OPEC and some of its rivals reached their first deal since 2001 to jointly reduce output to try to tackle global oversupply and boost prices. Brent crude futures were up $2.21 at $56.54 per barrel by 1125 GMT, having hit a session peak of $57.89, the highest since July 2015. "OPEC have taken a very important step towards stopping the relentless build up in global stock levels and speeding u