56 For we have learnt with great grief that, in those territories which have recently been made over to the sway of Russia, our dear brethren and sons of the Ruthenian people are in dire straits in consequence of their fidelity to the Apostolic See; every means are being employed to take them away from the bosom of their mother, the Church, and to induce them, against their will and against their known religious duty, to enter the communion of the dissidents. Thus it is reported that the clergy of the Ruthenian rite have complained in a letter to the civil government that in the Western Ukraine, as it is called today, their Church has been placed in an extremely difficult position; all its bishops and many of its priests have been arrested; and at the same time it has been prohibited that anyone should take up the government of the same Ruthenian Church.
Source: Orientales Omnes Ecclesias (Vatican.va)