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.
Krymchaks
The Krymchaks speak a modified form of the Crimean Tatar language, called the Krymchak language. It is the Jewish patois, or ethnolect of Crimean Tatar, which is a Kypchak Turkic language. Krimchak is not a distinct language, but only one constituent of Crimean Tatar. Before the Russian Revolution in 1917, the Krimchaks were at least bilingual: they spoke the Krimchak ethnolect and at the same time mostly used Hebrew for their religious life and for written communication. The Krimchaks adhered to their Turkic patois up to  World War II, but later began to lose their linguistic identity. Now they are making efforts to revive their language. Many of the linguistic characteristics of the Krimchak language could be found in the Crimean Tatar language. In addition, it contains numerous Hebrew and Aramaic loan-words and was traditionally written in Hebrew characters (now it is written in Cyrillic script).