Moscow Suspends Commemoration of Pat. Bartholomew- Calls for Urgent Meeting of Heads of Local Churches

...In this critical situation, when Constantinople has practically refused to resolve the matter by means of dialogue, the Moscow Patriarchate is forced to suspend the liturgical prayerful commemoration of the Patriarch of Constantinople and with profound regret to suspend the concelebration with hierarchs of the Patriarchate of Constantinople, as well as to break off the participation of the Russian Orthodox Church in the Episcopal Assemblies and in the theological dialogues, multilateral commissions and any other structures chaired or co-chaired by representatives of the Patriarchate of Constantinople.

In the event that the Patriarchate of Constantinople will continue to carry out its uncanonical activities in the territory of the Ukrainian Orthodox Church, we will be compelled to completely break off the Eucharistic communion with the Patriarchate of Constantinople. All the responsibility for the tragic consequences of this division will lie personally with Patriarch Bartholomew of Constantinople and the hierarchs supporting him.
Being aware that the current situation puts in jeopardy the whole world Orthodoxy, we at this hour of hardship ask the Local Autocephalous Churches for support and call upon the Primates of the Churches to fully realize our shared responsibility for the fate of the world Orthodoxy and initiate a fraternal pan-Orthodox discussion on the church situation in Ukraine.

We call upon the plenitude of the Russian Orthodox Church to pray ardently for the preservation of the unity of the Holy Orthodoxy.

Source.

This is not a formal severance of communion. But it is a step in that direction.