The Declaration lists the reasons that led the Russian Orthodox Church to take this decision.
The row is being described as the greatest Orthodox split since the schism with Catholicism in 1054.
The Moscow-based Russian Orthodox Church has at least 150 million followers - more than half the total of Orthodox Christians.
"Moscow's reaction to the actions of Kyiv and Fener demonstrates that we are on the right way", Poroshenko said.
This was said by the Chairman of the Division for exterior Church relations of the Moscow Patriarchate Metropolitan Hilarion of Volokolamsk.
Cemirtan argued that the Ukrainian church's independence means that it can avoid the "schizophrenia, as happens in [Moldova's breakaway region] Transnistria and Donbas [in eastern Ukraine], where the same church blesses different groups that are fighting each other". Last week's decision marked a step toward establishing an ecclesiastically independent - or autocephalous - church in Ukraine.
"We can't keep the contact with this church, who is in a situation of schism", he added.
These include: admitting into communion "schismatics", and "a person anathematized in another local Church", "encroachment on someone else's canonical regions", and "the attempt to abandon historical decisions and commitments". In the end, he said, they agreed that Estonia would have a church under Constantinople and a diocese under the Moscow Patriarchate.
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The Russian Orthodox Church's head, Patriarch Kirill, is seen as a close ally of President Vladimir Putin.
Many Ukrainian Christians accuse the Russian Church of favouring Russian-backed rebels in eastern Ukraine. A matter of our national security.
While the Patriarch of Moscow up to now has formally overseen Orthodox churches in Ukraine, the country has two other Orthodox authorities which have splintered off without being recognised by Constantinople - until last week.
One of them was the head of the Ukrainian Orthodox Church of Kiev Patriarchate (UOC-KP), Filaret Denisenko.
The president stresses that autocephaly is part of the state's pro-European and pro-Ukrainian strategy. He also expressed concerns over potential developments in Ukraine, where the rift between the Churches might affect "millions of believers".
For instance, he said, the Serbian Orthodox Church has been supportive of Moscow's position.
Monday will enter Orthodox history as "one of its darkest days", wrote Izvestia.
Now each of the branches of the Orthodox Church "will have to choose with whom to be - Constantinople or the Russian Orthodox Church", Izvestia wrote.