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From what I know, they were Indo-Europeans originating from north and north-east of the Black Sea, near Scythia.
They invaded parts of Asia Minor, some of which belonged to the Neo-Assyrian empire.

I don't know much about the Assyria Empire, meaning I know even less about the Neo-Assyria Empire. Actually, I've never heard of the revised version. That is another thing I should research, particularly in how some empires may revise, may resurrect, may reincarnate so to speak by another name to continue again. I love looking at patterns.

Honestly that's as much as I know XD not many people's specialty if we're honest. Would be interesting to look into tho ofc