 While their earlier location is disputed, it has been speculated by scholars for more than a century that the Yamnaya culture of the Pontic–Caspian steppe, in present-day Ukraine, around the Sea of Azov, spoke an early Indo-European language during the third and fourth millennia BC.The arrival of the Hittites in Anatolia in the Bronze Age was one of a superstrate imposing itself on a native culture (in this case over the pre-existing Hattians and Hurrians), either by means of conquest or by gradual assimilation.In archaeological terms, relationships of the Hittites to the Ezero culture of the Balkans and Maykop culture of the Caucasus have been considered within the migration framework.