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How did the Russian Orthodox Church and the Russian Church Outside Russia restore communion in 2007?

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The Russian Orthodox Church and the Russian Orthodox Church Outside of Russia (ROCOR) restored canonical communion in 2007 following a period of separation that began after the 1917 Russian Revolution.

Following the collapse of the Soviet Union in 1991, discussions regarding the potential reunification of these two bodies were initiated. These efforts culminated in 2007, when the churches successfully reunited by restoring canonical communion, effectively ending the schism that had persisted for decades between the Moscow Patriarchate and the émigré church.1