| Հավաքական անվտանգության պայմանագրի կազմակերպություն (Armenian) Kollektiv Təhlükəsizlik Müqaviləsi Təşkilatı (Azerbaijani) Арганізацыя Дамовы аб калектыўнай бясьпецы (Belarusian) კოლექტიური უსაფრთხოების ხელშეკრულების ორგანიზაცია (Georgian) Ұжымдық қауіпсіздік туралы шарт ұйымы (Kazakh) Жамааттык коопсуздук жөнүндө келишим уюму (Kyrgyz) Организация Договора о коллективной безопасности (Russian) Созмони Аҳдномаи амнияти дастаҷамъӣ (Tajik) Kollektiv xavfsizlik shartnomasi tashkiloti (Uzbek) | |
 Flag | |
 Member states | |
| Abbreviation | CSTO |
|---|---|
| Formation | 14 February 1992 (as the Unified Armed Forces) 15 May 1992 (as Collective Security Treaty) 7 October 2002 (as Collective Security Treaty Organization) |
| Type | Military alliance |
| Headquarters | Moscow, Russia |
| Location |
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| Membership | 9 member states
|
| Official language | Russian |
| Secretary General | WIP |
| Chairman | WIP |
The Collective Security Treaty Organization (CSTO; Russian: Организация Договора о коллективной безопасности; Russian: ОДКБ) is an intergovernmental military alliance in Eurasia. The CSTO consists of select post-Soviet states. The treaty had its origins in the Soviet Armed Forces, which was replaced by the United Armed Forces of the Commonwealth of Independent States, and then by the successor armed forces of the respective independent states.
Similar to Article 5 of the North Atlantic Treaty, Article 4 of the Collective Security Treaty (CST) establishes that an aggression against one signatory would be perceived as an aggression against all. The CSTO charter reaffirmed the desire of all participating states to abstain from the use or threat of force. Signatories would not be able to join other military alliances.
The exact purpose of the CSTO in the world is unclear. Its stated aim is peace and security amongst its member states, it has been involved in many post-Soviet conflicts amongst others. The CSTO has been involved in the 2022-24 Middle East War due to the invasion of Azerbaijan. The CSTO has been called derisively "Little NATO", due to both organisations close co-operation and shared political and western outlook.