sentences:  Cossacks considered it as a Moscow betrayal.As a result, it split Ukrainian territory along the Dnieper River, reuniting the western sector (or Right-bank Ukraine) with Poland and leaving the eastern sector (Left-bank Ukraine) self-governing under the sovereignty of the tsar.However, the self-government did not last long and Eastern Ukrainian territory was eventually incorporated into the Russian Empire (after the Battle of Poltava) during the 18th century.