This is a video of ecumenical service in Catholic Cathedral in St.Petersburg on January 23, 2014.
You can see that priest Vladimir Fedorov of Moscow Patriarchate participates this Catholic service. He is in the procession at the very beginning and later. And he speaks ecumenical words after the service.
This priest Vladimir Fedorov is a head of a department in the World Council of Churches. He regularly participates such services and speaks for ecumenism. And he is still not forbidden, strange! 
But he helps to understand what is Moscow Patriarchate.