personally, I think this is just a continuation of the usual Eastern Catholic wishful thinking or maybe even just plain misinformation.
Here is a rough translation of the German:
Patriarch Bartholomew Supports the Idea of “Double Unity”
of the Eastern Catholic Churches
17 June 2008 – In his recent interview with the ecumenical journal “Cyril and Methodius” the Ecumenical Patriarch Bartholomew touched on the question of the existence of the Eastern Catholic Churches. He invited these Churches, while remaining in union with Rome, to become Orthodox again. In particular he said that “the Constantinopolitan Mother Church always keeps the doors open for her sons and daughters.” In the words of the Orthodox First Hierarch, the model of unity can be the form of coexistence which was in place between the Byzantine and Roman Curches during the first millennium of Christianity, KATH.net stated on 16 June.
At the same time, the Patriarch expressed himself favorably concerning the idea of “double unity” which was proposed by the Chief Hierarch of the Ukrainian Greek-Catholic Church Major Archbishop Lubomyr (Husar). The Head of the Ecumenical Patriarchate explained that such a model would lead to the settlement of the division between the Churches. In the words of the Patriarch, Church unity is not “the result of the administrators of the Churches nor of theological fantasies”. “It is necessary to have more common efforts with the participation of Catholic, Orthodox, and Protestant communities, common projects, so as to know one another better. It is necessary to pray much, very much.” Patriarch Bartholomew said that important steps on the road to unity have already been taken. “The mutual anathemas of 1054 between the Churches have been lifted. The theological dialogue of the Orthodox Church with Anglicans, Lutherans, and Reformed is going ahead without interruption. After a pause of several years this dialogue is again renewed”.
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Maybe the Ecumenical Patriarch really did say: In particular he said that “the Constantinopolitan Mother Church always keeps the doors open for her sons and daughters.”
But I dount the Ecumenical patriarch would ever approve of "double unity". This is totally against basic Eastern Orthodox dogma.
However, it is an idea that the Ukrainian Catholics support and they are the leaders of claiming they are "Orthodox in union with Rome."
Speaking as a Ukrainian Orthodox Christian, I can say that Ukrainian Catholics cannot receive communion in my Church: only Orthodox Christians can partake of communion.
I am sad to say that every now and then a Ukrainian Catholic comes along who tries to join the communion line but our priest knows everyone who goes to confession and has turned away an Ukrainian Catholics who dare to try this
I have been trying to find the journal mentioned "Cyril and Methodius" on the internet to see the article cited. I think we should wait a few days to see how the Ecumenical Patriarchate responds to the German article.