(Reuters) -Ukrainian President Volodymyr Zelenskiy on Thursday called on Western politicians to quickly agree on an embargo of Russian oil, complaining that their failure to do so was costing Ukrainians their lives. In an early morning video address, Zelenskiy also said he would continue to insist Russian banks be completely blocked from the international finance system. Russia’s six-week-long invasion of Ukraine has forced over 4 million to flee, killed or injured thousands and left cities and towns destroyed. Zelenskiy said Moscow was making so much money from oil exports that it did not nee…