https://en.wikipedia.org/wiki/Yamnaya_culture
The Yamnaya culture or the Yamna culture (Russian: Ямная культура, romanized: Yamnaya kul'tura, Ukrainian: Ямна культура, romanized: Yamna kul'tura lit. 'culture of pits'), also known as the Pit Grave culture or Ochre Grave culture, was a late Copper Age to early Bronze Age archaeological culture of the region between the Southern Bug, Dniester, and Ural rivers (the ...