The ROC should also not be confused with the Russian Orthodox Church Outside Russia (also known as the Russian Orthodox Church Abroad, or ROCOR), headquartered in the United States. The ROCOR was instituted in the 1920s by Russian communities outside the Soviet Union, which had refused to recognize the authority of the Moscow Patriarchate that was "de facto" headed by Metropolitan Sergius Stragorodsky. The two churches reconciled on 17 May 2007; the ROCOR is now a self-governing part of the Russian Orthodox Church.