>>518534167
Bullshit.
Yamnaya peoples migrated into Poland, mixed with the locals and became Corded Ware.
Some of them went into Denmark, became Battle Axe and then Germanic.
Others went east.
Some reached the Urals, became Sintashta, then Andronovo, then Indians and Iranians.
Some who were going east did not migrate so far and stopped in Eastern Europe. They became Balts.
Finally, a particularly aggressive group of Balts from the Belarusian-Ukrainian border split off, became Slavs and spread over 2/3 of Europe in record time.