Singapore PRICES of Middle East and Russian spot crude grades sold in Asia hit multi-year highs as Asian oil buyers snapped up cargoes amid tighter supplies, trade sources said on Tuesday. US sanctions on Iran and Venezuela, disruptions of Russian oil flows in Europe and maintenance at oilfields in the Atlantic Basin and Asia have tightened global supplies and boosted Asia's demand for spot cargoes, they said. Japan's Fuji Oil bought a July-loading Murban crude cargo at a premium just under US$1 a barrel to its official selling price (OSP), the highest premium for the grade since 2015. Last week, Royal Dutch Shell paid a premium of US$6 a barrel to benchmark Dubai quotes for Russia's Sokol crude for July loading, the highest premium since 2014.