Brent crude rebounded from the lowest price in four days amid speculation that renewed tension between Ukraine and Russia may threaten Europe’s energy supplies. West Texas Intermediate was steady. Futures rose as much as 0.4 percent in London . President-elect Petro Poroshenko set Ukraine on a collision course with Russia even before the last vote had been counted, vowing to step up operations to rein in separatists in the country’s east. Consumer confidence in the U.S., the world’s biggest oil consumer, probably rebounded in May while services expanded at a reduced pace, according to economists surveyed by Bloomberg News before separate reports today. “Some geopolitical tension over Ukraine has crept back into the market,” Victor Shum, a vice president at IHS Energy Insight, a consultant, said by phone from Singapore today. “The situation has no immediate impact on oil supply but it affects the geopolitical tone in the market.” […]