Global benchmark oil prices are expected to open lower on Monday as a dispute between top crude exporters Russia and Saudi Arabia raises concerns of another collapse in talks to curb production at a meeting this week. Russian President Vladimir Putin put the blame for the crash in prices on Saudi Arabia on Friday - prompting a firm response from Riyadh the following day, disputing Putin's claims. Crude futures surged for a second day on Friday, with both U.S. and Brent contracts posting their largest weekly percentage gains on record due to hopes that a global deal to cut crude supply worldwide would be struck at talks, which are now set for April 9.