In the 13 th century Mongol-Tatars invaded the country. In the beginning of the 15 th century the ruined country could not recover from Timur’s armies invasion and save its integrity. In the 15 th century Georgian feudal state broke up into several separate kingdoms and princedoms (Kartli, Kakheti, Imeretia, Samtskhe-Saatabago, Mingrelia, Guria, and Abkhazia) were the objects of fierce struggle between Iran and Ottoman Empire ( Turkey ) for domination in Transcaucasia until the end of the 18 th century. Georgian governors asked Russia for military assistance.