While U.S. oil supply has been jumping Movement.up.gain fast , part of the big jump Movement.up.gain in supplies has come from countries that remain at risk of supply restrictions Cause.movement.down.loss , including Brazil and Nigeria .

While U.S. oil production has been jumping Movement.up.gain fast , part of the big jump Movement.up.gain in supplies has come from countries that remain at risk of production cuts Cause.movement.down.loss , including Kuwait and Russia .

NEW YORK -LRB- Reuters -RRB- - Brent crude oil reversed losses jumping Movement.up.gain back above $ 108 a barrel on Friday , as fighting Civil.unrest in Ukraine and deteriorating relations Geopolitical.tension between Russia and the United States ignited new fears of supply disruptions Cause.movement.down.loss in the market .