This is with regards to the Oriental Orthodox:
“We are rediscovering our unity,” said Card Walter Kasper, president of the Pontifical Council for Christian Unity, as he summarised the relationship between Catholic and Orthodox Churches.
............................
The division between the Catholic Church and this family of Orthodox Churches dates back to the 5th century AD, more precisely to the Council of Chalcedon (451 AD), which defined Christ’s dual nature, his "full humanity and full divinity, without confusion or division".
After 1,500 years, the Catholic and Eastern Orthodox Churches have come to realise that they share the same faith in Christ and that their dispute was the results of terminological and cultural differences. http://www.asianews.it/news-en/Cardinal ... 17502.html