Did the second vatican council lift excomunication decrees between the western and eastern churches?

Yes, the Second Vatican Council, which took place from 1962 to 1965, played a significant role in improving relations between the Western (Roman Catholic) and Eastern Orthodox Churches. In 1965, Pope Paul VI and Patriarch Athenagoras I of Constantinople lifted the mutual excommunications that had been imposed in 1054 during the Great Schism. This act was a significant step toward reconciliation and dialogue between the two branches of Christianity.