The siege of Kiev by the Pechenegs in 968 (sub anno 6476) is narrated in pages 65.19–67.20 of the Primary Chronicle. It is an account that freely mixes historical details with folklore.
Sviatoslav ultimately repelled the Pecheneg invasion and the Siege was a failure for the Pechenegs.
HistoryLayer draws the world as it was in any year from 123,000 BCE to
2026. Move the slider and the borders redraw for that year; the map
carries 23,890 events, 12,790 people, 837 wars and 13,183 cities, each
one readable in place. Signing in is optional and lets you keep what
you find.