During the First World War (1914–18) Russians invaded the provinces of Rize and Trabzon. However, following the Bolshevik Revolution in 1917, the Russian forces had to withdraw from the region and finally left the area to the Ottoman-Turkish forces in March 1918. From 1918 to 1920, the national movement swept rapidly all around Lazistan, committees and an interim government was created. It was oriented towards Soviet Russia. But as soon as, the Soviet-Turkish treaty of friendship was concluded, it helped the Turks, to integrate Lazistan. The autonomous Lazistan sanjak existed until 1923, while the designation of the term of Lazistan was officially banned in 1926, by the Kemalists. Lazistan was divided between Rize and Artvin provinces.