U.S. soon to grant more waivers to Iran sanctions By Simon Webb SINGAPORE (Reuters) - The United States will "very soon" announce a new list of countries that will receive waivers to financial sanctions on oil trade with Iran, a U.S. official said on Thursday. The latest round of U.S. sanctions come into effect on June 28 and aim to cut Iran's oil revenue to pressure Tehran into halting its nuclear program, which Western powers suspect is aimed at developing nuclear arms. The U.S. can exempt countries from sanctions if they make significant reductions to crude imports, and granted a waiver to Japan and 10 European countries in March. The official declined to give more details on which countries would join the exemptions list, but said the U.S. and South Korea had made progress in talks. Around two thirds of Iran's crude exports flow to Asia, where the biggest buyers are China, Japan, India and South Korea. Editing by Ed Lane