The Assyrians then went into schism amongst themselves after 1552, with one branch joining the Roman Catholic communion, and the other remaining independent. That independent part is what is now known as the Assyrian Church of the East.
The Assyrian Church, meanwhile, explicitly denied that they followed Nestorius’ teachings as recently as 1976, and there has been an ongoing rapprochement between them and other churches since at least the Second Vatican Council in the 1960s. It may well be that the schism between the Assyrians and other churches was all a major misunderstanding, or it may be that the Assyrians gradually came to adopt the same views as the Orthodox and Rome. Hard to say for sure.
