Post-Soviet states in the context of "Southern Military District"

Turks (Turkish: Türkler), or Turkish people, are the largest Turkic ethnic group, comprising the majority of the population of Turkey and Northern Cyprus. They generally speak the various Turkish dialects. In addition, centuries-old ethnic Turkish communities still exist across other former territories of the Ottoman Empire. Article 66 of the Constitution of Turkey defines a Turk as anyone who is a citizen of the Turkish state. While the legal use of the term Turkish as it pertains to a citizen of Turkey is different from the term's ethnic definition, the majority of the Turkish population (an estimated 70 to 75 percent) are of Turkish ethnicity. The vast majority of Turks are Sunni Muslims, with a notable minority practicing Alevism.

The ethnic Turks can therefore be distinguished by a number of cultural and regional variants, but do not function as separate ethnic groups. In particular, the culture of the Anatolian Turks in Asia Minor has underlain and influenced the Turkish nationalist ideology. Other Turkish groups include the Rumelian Turks (also referred to as Balkan Turks) historically located in the Balkans; Turkish Cypriots on the island of Cyprus, Meskhetian Turks originally based in Meskheti, Georgia; and ethnic Turkish people across the Middle East, where they are also called Turkmen or Turkoman in the Levant (e.g. Iraqi Turkmen, Syrian Turkmen, Lebanese Turkmen, etc.). Consequently, the Turks form the largest minority group in Bulgaria, the second largest minority group in Iraq, Libya, North Macedonia, and Syria, and the third largest minority group in Kosovo. They also form substantial communities in the Western Thrace region of Greece, the Dobruja region of Romania, the Akkar region in Lebanon, as well as minority groups in other post-Ottoman Balkan and Middle Eastern countries. The mass immigration of Turks also led to them forming the largest ethnic minority group in Austria, Denmark, Germany, and the Netherlands. There are also Turkish communities in other parts of Europe as well as in North America, Australia and the Post-Soviet states. Turks are the 13th largest ethnic group in the world.

Eastern Orthodoxy, otherwise known as Eastern Orthodox Christianity or Byzantine Christianity, is one of the three main branches of Chalcedonian Christianity, alongside Catholicism and Protestantism. Like the Pentarchy of the first millennium, the mainstream (or "canonical") Eastern Orthodox Church is organised into autocephalous churches independent from each other. In the 21st century, the number of mainstream autocephalous churches is seventeen; there also exist autocephalous churches unrecognized by those mainstream ones. Autocephalous churches choose their own primate. Autocephalous churches can have jurisdiction (authority) over other churches, some of which have the status of "autonomous" which means they have more autonomy than simple eparchies.

Many of these jurisdictions correspond to the territories of one or more modern states; the Patriarchate of Moscow, for example, corresponds to Russia and some of the other post-Soviet states. They can also include metropolises, bishoprics, parishes, monasteries, or outlying metochia corresponding to diasporas that can also be located outside the country where the primate resides (e.g., the case of the Ecumenical Patriarchate of Constantinople whose canonical territory is located partly in northern Greece and the east); sometimes they overlap (the case of Moldova where the jurisdictions of the patriarchs of Bucharest and of Moscow overlap).

An oblast (/ˈɒblɑːst/ ) is a type of administrative division in Bulgaria and several post-Soviet states, including Belarus, Russia and Ukraine. Historically, it was used in the Russian Empire and the Soviet Union. The term oblast is often translated into English as 'region' or 'province'. In some countries, oblasts are also known by cognates of the Russian term.

The Turks in Europe (sometimes called Euro-Turks; Turkish: Avrupa'daki Türkler or Avrupa'da yaşayan Türkler or Avrupa Türkleri) refers to Turkish people living in Europe.

Generally, "Euro-Turks" refers to the large Turkish diasporas living in Central and Western Europe as well as the Turkish communities in the former Ottoman Empire and those living in Russia and other European Post-Soviet states. When the term "Euro-Turks" is taken in its most literal sense, Turkish people living in the European portion of Turkey are also included in the term. Even more broadly, the Turkish Cypriot community for people living in Cyprus, which is located in Asia, has also been defined under the term "Euro-Turks" since the island joined the European Union.

Armenians (Armenian: հայեր, romanized: hayer, [hɑˈjɛɾ]) are an ethnic group indigenous to the Armenian highlands of West Asia. Armenians constitute the main demographic group in Armenia and constituted the main population of the breakaway Republic of Artsakh until their subsequent flight due to the 2023 Azerbaijani offensive. There is a large diaspora of around five million people of Armenian ancestry living outside the Republic of Armenia. The largest Armenian populations exist in Russia, the United States, France, Georgia, Iran, Germany, Ukraine, Lebanon, Brazil, Argentina, Syria, and Turkey. The present-day Armenian diaspora was formed mainly as a result of the Armenian genocide with the exceptions of Iran, former Soviet states, and parts of the Levant.

Armenian is an Indo-European language. It has two mutually intelligible spoken and written forms: Eastern Armenian, today spoken mainly in Armenia, Artsakh, Iran, and the former Soviet republics; and Western Armenian, used in the historical Western Armenia and, after the Armenian genocide, primarily in the Armenian diasporan communities. The unique Armenian alphabet was invented in 405 AD by Mesrop Mashtots.

The classification system of inhabited localities in Russia and some other post-Soviet states has certain peculiarities compared with those in other countries.