As a result of the 19th century Russo-Persian wars, the Russians took over the Caucasus, and Iran irrevocably lost control over its integral territories in the region (comprising modern-day Dagestan, Georgia, Armenia, and Azerbaijan), which got confirmed per the treaties of Gulistan and Turkmenchay.
The Gulistan and Turkmenchay treaties between Iran and Russia confirmed what?
Iran irrevocably lost control over its integral territories in the region