Which natives of the Ukrainian and Russian steppe played a pivotal role in aiding Russian expansion into Siberia during the 16^thcentury?

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The Cossacks, particularly the Don and Siberian Cossacks, played a key role in aiding Russian expansion into Siberia during the 16th and 17th century. They were skilled horsemen and fighters and served as frontier guards for Russia, pushing eastward and subduing native Siberian tribes.

Which Natives of the Ukrainian and Russian Steppe Played a Pivotal