If Putin was to pull off such an accord, after his conclave of Orthodox churches in Moscow, he could rightfully be declared a “Prince of Christendom”.
While conferring a pseudo-noble title on him, it would also in effect make Moscow an “Orthodox Rome”, religiously akin to the Byzantine Empire in the time prior to Charlemagne, yet one friendly to the Roman Papacy, surviving as it is, surrounded by pagans.
At Fatima, the Virgin Mary asked that Russia be specially consecrated to her Immaculate Heart. There is some disagreement about whether this has been effectively done or not in the efforts of two previous popes. In any case, Putin’s action puts quite an interesting light on this. He is a thug and a murderer as well as an adulterer, but is it possible that now, challenged by Islam, he recognizes that he needs help from God?
Simply put, No. Putin can’t.
NO
Rather, it was the dream of Blessed, soon to be made Saint John Paul II, that both the Catholic and Orthodox Churches come back together so that the two lungs of the Christian faith will begin to breathed together in full.