Iran's Oil Minister Bijan Zanganeh talks to journalists at the beginning of an OPEC meeting in Vienna, Austria December 6, 2018. (Reuters)
Iran appears to be the main obstacle for an OPEC oil output deal on Friday as the group's leader Saudi Arabia has yet to agree exemptions for sanctions-hit Tehran, two OPEC sources said.
The Organization of the Petroleum Exporting Countries resumes discussions on Friday in Vienna before heading into a meeting with non-OPEC oil producers led by Russia.
On Thursday, OPEC failed to agree concrete parameters for a deal to restrict output.
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