When the Orthodox (other than Moscow) and Roman Catholics met, they prayed, discussed and concluded that Bishop of Roman was Patriarch of the West and first among equal patriarchs. This is as the early Church operated through the last ecumenical council in 787.
They agreed at Rivenna that the Bishop of Rome has the same power and authority that he had in 787, no more and no less. Clearly, the Orthodox believed the RCC had added doctrines (filioque and the ex cathedra declarations) and the RCC thought that the Orthodox did not recognize the pope as Patriarch, and certainly not as protus (first among equals). There have been continuing decades of discussion with regard to exactly what power and authority the Bishop of Rome had in 787.
As an aside, the current pope has met with the Patriarch of Moscow who was not part of the joint declaration.
