Ecumenism of Blood demonstrates that it is possible within the status quo of Catholic doctrine for the Catholic Church to recognize in some official way, in this case liturgically, the Christian martyrs of the eastern churches.
Such a development would have immense implications as an example of realizable, practicable ecumenism, as well as a gesture of solidarity with an ancient and persecuted church.
Pope Francis's unsystematic references to ecumenism of blood offers an opening, though many.
Paulist Press Ecumenism of blood: heavenly hope for earthly communion, paperback/hugh somerville knapman
