Whether or not this is really an indication of a Mycenean invasion is contested. Kokkinokremos was a short-lived settlement, where various caches concealed by smiths have been found.
That no one ever returned to reclaim the treasures suggests that they were killed or enslaved.
Similarly, the Indo-Anatolian-speaking Hittites absorbed the Hattians, a people speaking a language that may have been of the non–Indo-European North Caucasian language group or a language isolate.
Other groups of Indo-European peoples followed the Phrygians into the region, most prominently the Doric Greeks and Lydians, and in the centuries after the period of Bronze Age Collapse, the Cimmerians, and Scythians also appeared.
Iranian peoples such as the Persians, Medes, Parthians and Sargatians first appeared in Ancient Iran soon after 1000 BC, displacing earlier non-Indo-European Kassites, Hurrians and Gutians in the northwest of the region, although the indigenous language isolate-speaking Elamites and Manneans continued to dominate the southwest and Caspian Sea regions respectively.
After the Orientalising period in the Aegean, Classical Greece emerged.
Upon the death of Ashur-bel-kala in 1056 BC, Assyria went into a comparative decline for the next 100 or so years, its empire shrinking significantly.
By 1020 BC Assyria appears to have controlled only the areas in its immediate vicinity; the well-defended Assyria itself was not threatened during the collapse.