Collective Security Treaty Organization

When Armenia was losing the 2020 war over Nagorno-Karabakh — when Azerbaijani forces, equipped with Turkish-supplied drones, were systematically destroying Armenian military positions and eventually forcing Yerevan to cede the territory it had held for twenty-six years — the Collective Security Treaty Organization did nothing. Armenia was a CSTO member in good standing. Azerbaijan was not. The treaty text contained provisions for collective response to threats against a member’s territory. And yet the CSTO’s secretary-general issued statements calling for de-escalation while offering no military support, no deterrent deployment, and no practical assistance to a member state facing military defeat.

That episode — replayed in different form in 2022 when Azerbaijan launched a further offensive against Armenian-controlled territory, and again in 2023 when Azerbaijani forces seized Nagorno-Karabakh entirely — explains why Armenia eventually suspended its participation in the CSTO and began seeking Western security partnerships. It also explains everything important about what the CSTO actually is: not a genuine collective defense organization on the NATO model, but a framework for managing Russian influence over post-Soviet states, useful to Moscow and of limited value to anyone else.

Origins: From Tashkent to a Treaty Organization¶

The Collective Security Treaty — the legal foundation of the CSTO — was signed in Tashkent on May 15, 1992, barely six months after the Soviet Union’s dissolution. The context was the chaotic security environment of the early post-Soviet space: newly independent states with Soviet-era weapons, unresolved territorial disputes, civil conflicts in Tajikistan and Georgia, and a Russia that was determined to preserve a sphere of influence even as it lacked the resources to project power effectively.

Nine of the fifteen former Soviet republics signed the original Tashkent Treaty: Russia, Armenia, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, Azerbaijan, Georgia, and Belarus. The early years were essentially nominal — the organization had no real military structure, no joint command, and no deployable forces. Azerbaijan and Georgia withdrew in 1999, preferring to develop relationships with NATO rather than deepen ties with Moscow. Uzbekistan participated intermittently, withdrawing definitively in 2012 after concluding that membership was incompatible with its foreign policy autonomy.

The organization was reconstituted as the CSTO — a formal international organization with a permanent Secretariat — in 2002, following the September 11 attacks and Russia’s calculation that the new security environment provided an opportunity to reinvigorate post-Soviet institutional architecture. The six current members — Russia, Armenia, Belarus, Kazakhstan, Kyrgyzstan, and Tajikistan — represent a cross-section of the post-Soviet space united primarily by dependence on or accommodation with Moscow.

Structure and Institutions¶

The CSTO’s formal architecture superficially resembles NATO’s. The Collective Security Council, comprising heads of state of member countries, serves as the organization’s supreme authority. A Council of Foreign Ministers and a Council of Defense Ministers handle their respective policy areas. A permanent Secretariat, based in Moscow, handles administrative functions. A Joint Staff oversees military coordination.

The most consequential military element is the Collective Rapid Reaction Force (CRRF), established in 2009. On paper, the CRRF comprises approximately 18,000-20,000 troops drawn from member states, with Russia providing the most capable contingent. The force is theoretically deployable for counter-terrorism operations, response to armed aggression, and crisis management within the CSTO area. In practice, the CRRF has been deployed for one genuine crisis operation in its history.

The comparison with NATO, which CSTO officials frequently invite, is misleading in almost every meaningful way. NATO’s collective defense commitment is embodied in Article 5, which has been invoked once (after September 11) and generates genuine allied military commitments. NATO has an integrated military command structure, common doctrine, regular interoperability exercises, and decades of institutional practice managing actual allied military operations. The CSTO has none of these things in comparable depth. Its exercises are smaller, less frequent, and less demanding. Its doctrine is Russian doctrine. Its command structure is, in practice, Russian command.

The difference is not merely quantitative — it reflects the fundamental political difference between an alliance of equals (NATO, however imperfect) and an organization structured around one dominant power (CSTO). NATO’s value to smaller members derives precisely from the fact that the United States is genuinely committed to their defense and capable of providing it. The CSTO’s value to smaller members is whatever Russia chooses to provide, constrained by Russia’s interests.

Kazakhstan: The One Real Deployment¶

The CSTO’s only genuine combat deployment occurred in January 2022, when Russian-led forces entered Kazakhstan to support the government of President Kassym-Jomart Tokayev against a wave of protests that had rapidly escalated into what appeared to be an armed uprising. The protests, which began over fuel price increases and spread to major cities including Almaty, saw government buildings seized, security forces attacked, and significant violence. Tokayev, in what appears to have been a genuinely desperate moment, invoked the CSTO’s collective security provisions and requested assistance.

Russian-led CSTO forces — approximately 2,500 troops from Russia, Belarus, Armenia, Kyrgyzstan, and Tajikistan — deployed within hours, securing key installations while Kazakhstani security forces suppressed the uprising. The operation was presented by Tokayev as a response to “terrorist” threats with foreign backing, though evidence for organized external instigation remained thin.

The Kazakhstan intervention revealed the CSTO’s real function with unusual clarity. The threat being addressed was not external aggression but domestic unrest — a government using a collective security framework to suppress its own population, with Russian forces providing the credible threat of overwhelming force. Tokayev subsequently moved to consolidate his own power against the clan associated with his predecessor, Nursultan Nazarbayev. Russian forces withdrew within weeks, having served their purpose.

For Russia, the intervention demonstrated CSTO’s utility as a mechanism for stabilizing friendly governments in the post-Soviet space — maintaining regimes that would remain within Moscow’s orbit. For Kazakhstan and other Central Asian members, the intervention raised uncomfortable questions about the conditions under which Russian troops might next appear on their soil.

The Armenia Catastrophe¶

Armenia’s experience in the CSTO is a case study in the limitations of alliance commitments when a dominant partner’s interests do not align with a smaller member’s survival.

The 2020 Nagorno-Karabakh war lasted forty-four days and ended with a Russian-brokered ceasefire that ceded most of the territory Armenian forces had held since 1994. Azerbaijan, backed by Turkey — a NATO member — had deployed Bayraktar TB2 drones with devastating effect, systematically destroying Armenian armor and artillery. Armenia’s military was outclassed. Throughout the conflict, CSTO made no military response.

Russia’s calculation was apparent: it had close relations with both Armenia and Azerbaijan, was the primary arms supplier to both, and had no interest in being drawn into a conflict on one side. The CSTO’s commitment to defend Armenia’s territory did not extend to defending Armenian-controlled territory in Nagorno-Karabakh, which was legally Azerbaijan’s sovereign territory. This legal distinction — however thin it seemed to Armenians watching the war — provided Russia with cover for inaction.

In September 2022, Azerbaijan launched a further military operation against Armenian-controlled territory in the vicinity of Lachin, with cross-border shelling of Armenian proper. Again, CSTO deployed no forces and provided no military deterrence. Armenia’s Prime Minister Nikol Pashinyan publicly questioned whether CSTO membership had provided any security benefit. In 2023, when Azerbaijan seized Nagorno-Karabakh entirely and more than 100,000 ethnic Armenians fled to Armenia proper in a matter of days, the CSTO’s response was diplomatic statements.

Armenia’s subsequent turn toward the West — applying for EU observation missions on its border with Azerbaijan, participating in EU-mediated negotiations, conducting joint military exercises with the United States, and suspending CSTO participation in 2024 — was the logical consequence of the organization’s failure. Pashinyan stated publicly that CSTO had failed Armenia and that Armenia needed to develop security relationships that would actually function.

Belarus: The Most Dependent Member¶

Belarus’s position in the CSTO is qualitatively different from that of any other member. President Alexander Lukashenko, whose government survived the mass protests of 2020 only because of direct Russian political and security support, is existentially dependent on Moscow. Belarus has no realistic alternative security partner — its political isolation from the West following the crackdowns on protesters, the forced diversion of a Ryanair flight to arrest an opposition journalist, and the subsequent sanctions have closed every Western door.

For Russia, Belarus’s dependency is an asset. Russia has been granted basing rights in Belarus, uses Belarusian territory for transit (including, catastrophically for Belarus’s reputation, as a staging area for the February 2022 invasion of Ukraine), and exercises decisive influence over Lukashenko’s government. Belarus is, in effect, a Russian satellite, and its CSTO membership is the institutional expression of that dependency rather than any genuine mutual commitment.

Central Asian Ambivalence¶

Kazakhstan, Kyrgyzstan, and Tajikistan remain CSTO members, but their relationship with the organization is marked by a constant tension between formal membership and the desire to limit Russian influence on their territories. None of these states has accepted permanent Russian military bases as part of CSTO commitments (Russia maintains bases in Kyrgyzstan and Tajikistan under bilateral agreements, but these predate and exist separately from CSTO). None has shown enthusiasm for deploying forces in support of Russian foreign policy objectives.

Kazakhstan’s response to Russia’s February 2022 invasion of Ukraine was particularly notable. Tokayev, speaking at an international forum, stated publicly that Kazakhstan would not help Russia evade Western sanctions and would not recognize the independence of the Donetsk and Luhansk “republics” that Russia had invented as a pretext for invasion. Kazakhstan maintained trade relations with Ukraine and sent humanitarian aid. For a CSTO member whose government had received Russian military assistance a mere six weeks earlier, this was a remarkable display of independence.

The Central Asian states use CSTO membership as one instrument among many — maintaining relationships with Russia, China, and increasingly the United States and Europe simultaneously. They value Russian security guarantees against certain threats (Islamist insurgency, Tajikistan’s civil war legacy, border conflicts between Kyrgyzstan and Tajikistan) while resisting Russian dominance on questions of sovereignty and economic orientation. CSTO is, for them, a manageable entanglement rather than a genuine alliance.

The Ukraine Contradiction¶

Russia’s February 2022 full-scale invasion of Ukraine created an existential contradiction for the CSTO that the organization has never resolved. Ukraine was not a CSTO member and was not the victim of CSTO aggression. But Russia — the CSTO’s largest and most powerful member, the state on whose military capacity the organization’s security guarantees ultimately depend — launched the largest war of territorial conquest in Europe since 1945 in violation of the UN Charter, the Budapest Memorandum (under which Ukraine had surrendered its nuclear weapons in exchange for security assurances from Russia), and every principle of international order the CSTO formally endorses.

CSTO members offered no public criticism of the invasion beyond generalities about peace and dialogue. Belarus actively facilitated it. Kazakhstan, Kyrgyzstan, and Tajikistan abstained on UN resolutions condemning the invasion, neither endorsing nor opposing Russia’s action. Armenia, uniquely among CSTO members, voted for some UN resolutions critical of Russia — an early signal of its shifting orientation.

The Ukraine war also raised practical questions about the CSTO’s military credibility. Russia committed the vast majority of its ground forces to Ukraine, suffering enormous casualties. The forces notionally available for CSTO commitments elsewhere — the basis of the security guarantees Russia was offering its allies — were being ground up in Kherson, Bakhmut, and Avdiivka. The guarantee that Russia would defend CSTO members became simultaneously more obviously hollow (Russia cannot spare the forces) and more obviously the wrong question (Russia may itself be the threat).

A Hollow Institution¶

The CSTO’s fundamental problem is that genuine collective security requires members who are willing to fight for each other — not just in the abstract language of treaty text, but in practical military deployments that incur costs and risks. NATO has this quality, imperfectly. The CSTO does not. Russia is not willing to fight for Armenia against Azerbaijan when doing so conflicts with Russian equidistance. CSTO members are not willing to fight for Russia in Ukraine. The bilateral security dependencies that the organization rationalizes are real enough, but they do not constitute an alliance in any meaningful sense.

What the CSTO provides is a framework for Russian influence dressed in the language of multilateral collective security. It provides Russia with a forum to coordinate with dependent states, a mechanism for legitimizing Russian military presence in the post-Soviet space, and a rhetorical counterweight to NATO in Russian diplomatic discourse. It provides smaller members with modest access to Russian military equipment, training, and intelligence, along with the theoretical deterrent of Russian backing — a deterrent that the Armenian experience demonstrated is contingent on Russian interests.

As Russia’s military and economic resources are depleted by the Ukraine war, as Armenia’s departure signals that the organization’s security guarantees are unreliable, and as Central Asian states continue hedging between Russia, China, and the West, the CSTO’s relevance appears to be diminishing. Whether it eventually dissolves or simply persists as an ever-more-hollow shell remains to be seen.

Sources & Further Reading¶

• “The Post-Soviet Wars: Rebellion, Ethnic Conflict, and Nationhood in the Caucasus” by Christoph Zürcher — essential background on the conflicts that have tested and found wanting CSTO’s security guarantees in the South Caucasus.

• “Russia’s Wars in Chechnya, 1994-2009” by Mark Galeotti — examines Russian military culture and the instruments of Russian security policy that underlie CSTO’s actual capabilities.

• “Eurasian Integration: The View from Within” edited by Pál Dunay and Victor Kremenyuk — a multi-author examination of Russia’s post-Soviet integration projects, including comparative analysis of CSTO alongside the Eurasian Economic Union.

• “The Return of Russia’s Sphere of Influence” by Fyodor Lukyanov — a Russian foreign policy theorist’s account of Moscow’s strategic thinking about post-Soviet security architecture.

• “Armenia’s Security Dilemma: Between Russia and the West” by Sergey Minasyan — analyzes Armenia’s security choices before and after the 2020 war, providing the most detailed account of CSTO’s failure from an Armenian strategic perspective.