By 1916, most of Western Armenia was occupied by Russian Empire as part of the Caucasian Campaign of World War I. In the occupied areas the Republic of Van was established until 1918, when the Russian army left the region due to the Revolution of 1917.
Most of Western Armenia was occupied by Russian Empire as part of the Caucasian Campaign of World War I. This was by 1916. The Republic of Van was established until 1918 World War I. This was in the occupied areas. The Russian army left the region due to the Revolution of 1917.