Which group of invaders were descendants of the huns, fought on horseback, and invaded europe from the east?

The Magyars

"Hungarians (= the Magyars) are the descendants of Magor, and the Huns are the descendants of his brother, Hunor. So these are two different nations. The Huns are already extinct / melted to other nations"

technically they're not the descendants of the Huns but they were the only ones I could find. I hope this helps you!!

The first one is russia because in russia they were on the rough times and they never had a way to get out of