By Joice Alves LONDON (Reuters) -Global markets are already pricing chunky geopolitical risks, but there is scope for risk premia to rise further across all sectors, if a conflict breaks out between Russia and Ukraine, Goldman Sachs strategists said in a note on Monday. Current market levels imply a 5% discount is already priced into U.S. stocks, while European stocks carry an 8% geo-political discount, Goldman wrote. It estimated the U.S. 10-year Treasury discount at 25 basis points and 2% on the euro. It said gold was trading at a 5% premium. Goldman Sachs strategists said that while this di…