Possible sanction-ending Iran deal drops crude prices

Venezuela's Maduro Says Oil Being Used for 'Geopolitical War'

How America can counter OPEC’s power

Oil ends on a low after halving in 2014 as OPEC stands aside

Greenspan: Structure of the Oil Market Has Changed

The reason oil could drop as low as $20 per barrel: Kaletsky

OPEC slashes oil production estimate; crude slumps again

U.S. producers answer Saudis challenge on price