The first non-Russian area to be annexed into the Russian empire,in the early seventeenth century,was:

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The Russian empire began expanding eastward in the early seventeenth century, and Siberia was the first non-Russian area to be annexed. The conquest of Siberia began in 1582 when a Cossack named Yermak led an expeditionary force into the region. Over the next several decades, Russian forces gradually extended their control over the region, pushing eastward towards the Pacific Ocean. By the mid-seventeenth century, Siberia was firmly under Russian control and had become an important source of fur and other resources for the empire.

The First Non-Russian Area to Be Annexed into the Russian