OPEC oil producers increasingly favor extending beyond June a pact on reducing crude supply to balance the market, sources within the group said, although Russia and other non-members need to remain part of the initiative. The Organization of the Petroleum Exporting Countries is curbing its output by about 1.2 million barrels per day (bpd) from Jan. 1 for six months, the first reduction in eight years. Russia and other non-OPEC producers agreed to cut half as much. The deal has lifted oil prices LCOc1, but inventories in industrial nations are rising and higher returns have encouraged U.S. companies to pump more. A growing number of OPEC officials believe it may take longer than six months to […]