Deportation of the Chechens and Ingush
The Chechens and the Ingush speak languages that are closely related and have a degree of passive intelligibility, both being Vainakh languages. The Chechen-Russian conflict is one of the longest and most protracted conflicts in modern history, spanning three centuries. Its origins date back to 1785, when the Chechens fought against Russian expansionism into the Caucasus. The Caucasus War was fought between 1817 and 1864. The Russian Empire succeeded in annexing the area and subjugating its people, but also killed or deported numerous non-Russian peoples and was responsible for the Circassian genocide. The Circassians, the Ubykh and the Abaza were subsequently resettled to the Ottoman Empire. However, other Caucasus people were affected as well. There were up to 1.5 million Chechens in the Caucasus in 1847, but as a result of this war and ensuing expulsions, their number dropped to 140,000 in 1861, and then further to 116,000 in 1867. In 1865, at least 39,000 Chechens were exiled to the Ottoman Empire by the Russian Empire.
Itelmens
Native peoples of Kamchatka (Itelmen, Ainu, Koryaks and Chuvans), collectively referred to as Kamchadals, had a substantial hunter-gatherer and fishing society with up to fifty thousand natives inhabiting the peninsula before they were decimated by the Cossack conquest in the 18th century. So much intermarriage took place between the natives and the Cossacks that "Kamchadal" now refers to the majority mixed population, while the term "Itelmens" became reserved for persistent speakers of the Itelmen language. By 1993, there were less than 100 elderly speakers of the language left, but some 2,400 people considered themselves ethnic Itelmen in the 1989 census. By 2002, this number had risen to 3,180, and there are attempts at reviving the language. According to the 2010 census, there were 3,193 Itelmen in Russia.