OPEC Boss Warns of Oil-Market Instability If No Deal on Output

The group's internal disagreements have so far prevented a deal to secure cooperation from major non-OPEC suppliers such as Russia after rounds of talks in Vienna. The producers will meet again in the Austrian capital later this month. OPEC, which pumps about 40 percent of the world's oil, is trying to persuade suppliers from outside the group to join the cuts. The 14-member group has held talks in the past weeks with producer nations including Russia, Azerbaijan, Brazil, Kazakhstan and Mexico.