LONDON—Benchmark Brent crude oil prices climbed close to $120 a barrel on Thursday, with Russian oil exports disrupted as traders try to avoid becoming entangled in sanctions. Support also came from U.S. crude stockpiles at multi-year lows, helping to lift Brent crude futures as high as $119.84 a barrel for the highest level since 2012. By 1024 GMT the contract was up $2.18, or 1.9 percent, at $115.11 a barrel. Brent has jumped by about 37 percent in the past 30 days and the contract’s six-month spread hit a record high on Thursday at more than $21 a barrel, indicating very tight supplies. U.S. West Texas Intermediate crude hit a high of $116.57, its loftiest since 2008, before retreating a little to $113.12, up to $2.52 or 2.3 percent. The gains followed a fresh round of U.S. sanctions that target Russia’s oil refining sector, raising concerns that Russian oil and …