By Dmitry Zhdannikov and Julia Payne LONDON (Reuters) – Disruptions to Russian oil exports intensified on Wednesday with more countries and companies refusing to import and transport Russian crude and at least 10 tankers failing to find buyers, driving oil and gas prices higher. The United States and the European Union have imposed harsh sanctions on Russia for the invasion of Ukraine but so far have refrained from direct measures on Russian energy exports after oil and gas prices have soared to multi-year highs. U.S. officials gave conflicting messages on Wednesday with the White House spokes…