Doha oil freeze talks face last-minute trouble

By Rania El Gamal and Reem Shamseddine DOHA (Reuters) - A meeting between OPEC and non-OPEC oil producers on an agreement to freeze output ran into last-minute trouble in Qatar on Sunday due to a new request by OPEC's de facto leader Saudi Arabia, sources told Reuters. Oil ministers were heading into a meeting with the Qatari emir, Sheikh Tamim bin Hamad al-Thani - who was instrumental in promoting output stability in recent months - in an attempt to rescue the deal designed to bolster the flagg