OPEC+, a group made up of the Organization of the Petroleum Exporting Countries and allies including Russia, which produces about 40% of the world's oil, has been cutting oil production since November amid falling prices. Saudi Arabia and Russia, the world's biggest oil exporters, stepped up cuts in oil supplies on Monday to drive up prices. However, the move only lifted the market briefly. Both cuts come on top of a broader OPEC+ deal to limit supplies until 2024, originally introduced in April, and provide for a total announced production cut of more than five million barrels per...