Can the bishop of Moscow speak ex cathedra on behalf of the entire Roman Catholic church?
Can the bishop of Moscow speak ex cathedra on behalf of the entire Roman Catholic church?
No. That is not his jurisdiction. He can speak on behalf of the Russian Orthodox Church. That is is his jurisdiction. He also cannot speak on behalf of the Greeks or the Alexandrians or the Constantinoplians either. Those don't fall within his jurisdiction either.
At a more local level, the Bishop of Davenport cannot speak on behalf of the Diocese of Peoria. Adjacent dioceses. That is the way that the Church has worked for the last two millennia.