WASHINGTON (Reuters) - The United States is preparing to expand sanctions imposed on Russian oligarchs, their companies and family members over Vladimir Putin's invasion of Ukraine, The Washington Post reported on Wednesday, citing three people familiar with the measures.

       The White House and Treasury Department are preparing a list of people that will overlap some with those sanctions by the European Union on Monday, including Alisher Usmanov, the owner of an iron and steel conglomerate, the Post reported, citing internal deliberations.

       (Reporting by Susan Heavey and Doina Chiacu; Editing by Louise Heavens)