1996 Moscow–Constantinople schism

In 1996, a schism between Moscow and Constantinople occurred; this schism began on 23 February 1996, when the Russian Orthodox Church severed full communion with the Ecumenical Patriarchate of Constantinople, and ended on 16 May 1996 when the Russian Orthodox Church and the Ecumenical Patriarchate reached an agreement. This excommunication by the Russian Orthodox Church was done in response to a decision of the synod of the Ecumenical Patriarchate to reestablish an Orthodox church in Estonia under the Ecumenical Patriarchate's canonical jurisdiction as an autonomous church on 20 February 1996.

Source: Wikipedia — 1996 Moscow–Constantinople schism (CC BY-SA 4.0)