Janislawice, and ultimately Dnieper-Donets, both originate in the earlier Mesolithic Kudlaev culture which seems to also be Ancestral to the Narva culture and related to the Kunda Culture. A "Baltic" horizon can be drawn based on this, stretching from Luhansk to latvia

Janislawice-Dnieper donets reach their Maximum in 5100BC, although Janislawice barely survives the onslaught of Neolithic farmers, the Dnieper donets expand massively (in orange) across the north of the steppe.

These people were Extremely tall and Robust and possibly gave Sredny-Stog its I2 (Not entirely sure about this anymore though). Nevertheless their influence on Sredny stog is also Archaeologically visible, but they retreat from Ukraine with Sredny stogs expansion

A more detailed map of What was happening during this time Dnieper Donets is at its peak while Janislawice survives in the Forested regions the LBK farmers avoid. Bug-Dniester to the south, a unrelated HG group from the Grebenyky culture, is also being subsumed by the LBK

It should be noted that Prior to the Janislawices movement into Poland, a different culture called Komornica (in grey) was present there with Connections to the west. Komornica also resisted the Farmer Expansion, Lasting out until 4000BC when the Funnelbeaker expanded

Map of TRB expansion into Poland around 4100-3700bc. Black dots are late Mesolithic sites of surviving Hunter gatherers

Dnieper Donets is not PIE because of its origin so far to the West in the Baltic. Sredny-stog, a actual Indo-European culture moved in from the East (Out of the Skelya culture) and mixed with Dnieper-Donets but largely lived to the South of their Territory

Another very notable Pre-PIE steppe culture are Kukrek who were in the Southern steppe prior to Dnieper-donets and Cuceteni Trypillia. They did not contribute much, apart from possibly the Bug-Dniester culture, although this probably originates in the-

Grebenyky culture, probably made up of Balkan Hunter Gatherers fleeing the sudden Karanovo and Starcevo-Körös-Cris expansion into Romania in the Early Neolithic. This movement also pushed Kukrek further North, likely contributing to the Dnieper Donets ethnogenesis

Kukrek is Incredibly old, and Predates both the Indo-Europeans, Janislawice Cultures, and the Farmers

@VVeltkrieger Maybe it's actually the older Mariupol culture and it's two subgroups Azov-Dnieper culture and Lower Don culture that are always lumped in with Dnieper Donets but are actually separate and older.