OPEC’s final push to implement the Algiers supply accord and boost oil prices shifted focus to Iran and non-members such as Russia as Iraq appeared to reverse its opposition to output cuts. The extension of shuttle diplomacy — including a visit to Tehran from an architect of the September agreement and an unusual Vienna breakfast with non-OPEC ministers — comes after an OPEC committee failed this week to hammer out details of how producers will share the burden of cuts. With less than a week until the crucial Vienna ministerial meeting, the refusal of just one major producer to participate could scuttle the whole deal . Even if Iraq, second only to Saudi Arabia in the Organization of Petroleum Exporting Countries, is on board, other obstacles remain. Iran, the group’s third-largest producer, is insisting it should be allowed to keep increasing output […]