The Mikhaylovka culture (3600—3000 BCE) is an early Yamna site of the late copper age of the lower Dnieper River, noted for its fortifications.
Mikhaylovka I (3600-3400 BCE) had connections to the west, and is related to the Kemi Oba culture (3700-2200 BCE) at the Bug-Dniepr area and the Crime, and seems to have had connections to the Maykop culture (3700-3000 BCE).
Mikhaylovka II (3400-3000 BCE) had connections to the east, as reflected by its repin-style pottery. Mikhaylovka II is divided into a lower (3400-3300 BCE) and an upper level (3300-3000 BCE). Mikhaylovka II shows a shift from farming to cattle herding, typical for the Yamna horizon.
References
Mikhaylovka culture Wikipedia(Text) CC BY-SA