Since the Russo-Turkish War , 1828-1829 , the term `` Western Armenia '' has referred to the Armenian-populated historical regions of the Ottoman Empire that remained under Ottoman rule after the eastern part of Armenia was ceded to the Russian Empire .
Since Russo-Turkish War , 1828-1829 that term is referred to the Armenian-populated historical regions of the Ottoman Empire that remained under Ottoman rule after the eastern part was ceded to the Russian Empire .