Russia's sovereign wealth fund will take a punt on gold and slash $40 billion of US currency entirely out of its investment portfolio amid growing tensions with Washington, the country's finance minister announced on Thursday. Anton Siluanov said that the National Wealth Fund would reduce its share of dollars to zero within the next month. Speaking as part of the St. Petersburg International Economic Forum, he said that the process would be "fast enough" and would mirror a similar move by the country's central bank to reduce assets held in American currency.