I reported tensions before but things have escalated. The Patriarch of Moscow has broken communion with the Patriarch of Constantinople over the issues disputed regarding the status of the Ukrainian Orthodox Church. You can read it in a variety of places. The simple sentence below hides the profound significance of the broken communion.
"Members of the Russian Orthodox Church (ROC) are now forbidden to pray and receive communion in the monasteries and churches on Mount Athos, said Igor Yakimchuk (spokesman for Patriarch Kirill) and Alexander Volkov (secretary of the Moscow Department for External Church Relations). For prayer in any churches of the Constantinople Patriarchate, Russian Orthodox Christians will have to repent of this sin at confession."