Brent crude extended declines from a four-week low after Saudi Arabia’s deputy crown prince said the world’s biggest oil exporter will freeze output only if Iran follows suit, putting in doubt the success of a proposed deal between major producers. Futures dropped as much as 1.4 percent in London following a 4.1 percent slump on Friday. Saudi Arabia’s Mohammed bin Salman signaled in an interview with Bloomberg that if any country raises output, his nation will also increase sales. With producers scheduled to meet this month to discuss an agreement on capping supplies, Iran’s oil minister said he’ll attend the gathering if he finds the time. The Saudi comments have halted a more than 40 percent rally in oil since mid-January. Investors have this year speculated that waning production in the U.S. would ease a glut as Saudi Arabia, Russia and others moved to cap output. Iran’s determination to […]