Metropolitan Hilarion said the church's Holy Synod decided to "break the Eucharistic communion" with the Istanbul-based Ecumenical Patriarchate.
The move comes after the Istanbul-based patriarchate, whose head Bartholomew I is considered the "first among equals" of Orthodox church leaders, removed its condemnation of leaders of schismatic Orthodox churches in Ukraine.
Last week's decision marked a step towards establishing an ecclesiastically independent - or autocephalous - church in Ukraine.
The church in Ukraine has been under the jurisdiction of the Russian Orthodox Churchsince the late 1600s, but calls for independence have increased since Moscow's 2014 annexation of the Crimean Peninsula from Ukraine.
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