Russian expansion into which region came at the expense of the Ottoman Empire and Persia?

Question

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The Russian expansion into the Transcaucasus came at the expense of both the Ottoman Empire and Persia. The region includes present-day countries of Armenia, Azerbaijan, and Georgia, and was a strategically important area for Russia due to its proximity to the Caspian Sea and access to trade routes. The Ottomans and Persians had previously fought over control of the region, but Russia began to gradually gain dominance over it from the 18th century onward.

Russian Expansion into Which Region Came at the Expense of the Ottoman