The price of Russia’s flagship Urals crude at the Black Sea plunged to as low as $36.61 per barrel at the end of last week, the lowest in nearly three years, as the U.S. sanctions on the two biggest Russian producers and exporters, Rosneft and Lukoil, are slated to take effect from Friday. On Thursday last week, the price of Urals loaded at the Novorossiysk port in the Black Sea slumped to $36.61 per barrel, before recovering slightly on Friday, according to data from Argus Media and Bloomberg. That’s the lowest Urals has traded…