Kammala jumla mai zuwa: Crimean Tatars da Nogai Tatars a al'adance suna amfani da yankin da ba a cika zama ba na Wild Fields a kan iyakar kudancin Rasha nan da nan kudu da Severia don ƙaddamar da hare-hare na shekara-shekara a cikin yankunan Rasha tare da Muravsky Trail da Izyum Trail. A shekara ta 1591, wani harin Tatar ya kai yankin Moscow, wanda ya tilasta wa gwamnatin Rasha ta gina sabbin sansanonin Belgorod da Oskol a 1593, Yelets a 1592, Kromy a 1595, Kursk a 1597, Tsarev-Borisov da Valuyki a 1600. Tsarev-Borisov, mai suna bayan Tsar Boris I, shi ne mafi tsufa ƙauye a Sloboda Ukraine. A lokacin waɗannan hare-haren, yankunan da ke kusa da Ryazan da kuma Kogin Oka sun sha wahala sosai. Tare da fadada yankin Rasha zuwa kudu da gabas a cikin ƙasashen Sloboda Ukraine na zamani da tsakiyar Kogin Volga rikicin ya tsananta. Wani lokaci tsakanin 1580s da 1640s an gina "Layin Tsaron Belgorod" tare da adadin sansanonin, koguna, da kagara a Sloboda Ukraine, yana ba da tsaro ga yankin. Bayan da dama
Yaƙe-yaƙe na Russo-Crimean, sarakunan Rasha sun fara ƙarfafa yankin da Cossacks suka yi aiki a matsayin wani nau'i na masu tsaron iyaka a kan hare-haren Tatars.