Collective Security Treaty Organization
Military alliance of six post-Soviet states
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| December 4 2024 | During parliamentary discussions, Pashinyan stated that Armenia considers itself outside the CSTO and has 'crossed the point of no return'. |
| August 17 2024 | CSTO countries reported to have neither supported nor condemned the Ukrainian invasion of Russia. |
| June 12 2024 | Armenia announced it would formally withdraw from the CSTO alliance at an unspecified later date. |
| May 8 2024 | Armenia stopped making financial contributions to the CSTO. |
| February 23 2024 | Armenian Prime Minister Nikol Pashinyan confirmed that Armenia had frozen its participation in the CSTO. |
| October 2023 | Armenia declined participating in military exercises at the CIS summit and asked for Russian peacekeeping forces to return to Russia. |
| September 2023 | During protests following the Azerbaijani offensive in Nagorno-Karabakh, demonstrators surrounded the Russian embassy and called for Armenia's withdrawal from the CSTO. |
| September 3 2023 | Pashinyan stated it was a strategic mistake to solely rely on Russia for security and that Moscow could not meet Armenia's security needs. |
| May 2023 | Armenian Prime Minister Nikol Pashinyan indicated potential withdrawal from the CSTO due to lack of support in the Armenia-Azerbaijan conflict. |
| January 2023 | Pashinyan refused to hold common military drills due to the organization's lack of unequivocal condemnation of Azerbaijan. |
| January 1 2023 | Imangali Tasmagambetov, former Kazakh Prime Minister, assumed the role of Secretary General of the Collective Security Treaty Organization. |
| November 23 2022 | A regular Collective Security Council meeting took place with all CSTO member leaders present, during which Pashinyan refused to sign the joint declaration due to lack of response to Azerbaijani aggression. |
| October 28 2022 | An extraordinary CSTO session was held via videoconference to discuss the results of the CSTO mission, chaired by Armenian Prime Minister Nikol Pashinyan. |
| September 17 2022 | US House of Representatives Speaker Nancy Pelosi visited Yerevan, seen as an effort to potentially reorient Armenia's security alliance. |
| September 13 2022 | Armenia triggered Article 4 of the CSTO treaty after renewed fighting with Azerbaijan, and a CSTO mission was sent to monitor the border situation. |
| February 2022 | During the Russian invasion of Ukraine, CSTO members remained largely uninvolved, with Belarus being the only member to house Russian troops for attacking Ukraine. |
| January 11 2022 | CSTO forces began their withdrawal from Kazakhstan. |
| January 5 2022 | CSTO peacekeepers were announced to be deployed to Kazakhstan in response to anti-government unrest. |
| 2021 | Uzbekistan conducts bilateral military exercises with Russia and a trilateral military exercise with Russia and Tajikistan. The Uzbek president also attends a CSTO meeting as a guest, sparking speculation about potential reentry into the Collective Security Treaty Organization. |
| 2021 | The Islamic Republic of Afghanistan collapsed as the Taliban took over, effectively ending its observer status in the CSTO Parliamentary Assembly. |
| July 2021 | Tajikistan appealed to CSTO members for help in managing security challenges from Afghanistan, following Taliban insurgents' takeover and the subsequent flight of Afghan police and government troops. |
| July 2021 | CSTO Secretary-General Stanislav Zas was criticized by Armenian politicians for his passive response to Azerbaijani forces' incursion onto Armenian territory. |
| December 11 2020 | Uzbekistan becomes an observer to the Eurasian Economic Union (EAEU), signaling potential renewed engagement with regional organizations. |
| March 19 2015 | CSTO Secretary General Nikolai Bordyuzha offered to send a UN-authorized peacekeeping mission to Donbas, Ukraine, highlighting the organization's peacekeeping readiness. |
| August 2014 | CSTO members (Armenia, Belarus, Kazakhstan, Kyrgyzstan, Russia, and Tajikistan) conducted joint psychological and cyber warfare exercises in Kazakhstan, involving 3,000 soldiers. |
| 2013 | The National Assembly of the Republic of Serbia was accorded observer status in the CSTO Parliamentary Assembly. |
| 2013 | The Wolesi Jirga (lower house) of the National Assembly of Afghanistan was granted observer status in the CSTO Parliamentary Assembly. |
| December 2012 | The CSTO Collective Security Council decided to suspend Uzbekistan's membership. |
| June 28 2012 | Uzbekistan submitted a notification to suspend its CSTO membership. |
| December 21 2011 | Treaty parties gained the ability to veto the establishment of new foreign military bases in CSTO member states. |
| 2010 | CSTO established the Collective Rapid Reaction Force (CRRF), designed to respond to military conflicts and humanitarian emergencies in the region. |
| 2010 | The Parliamentary Assembly of the Union of Belarus and Russia was granted observer status in the CSTO Parliamentary Assembly. |
| December 10 2010 | Member states approved a declaration establishing a CSTO peacekeeping force and signed a package of joint documents. |
| July 21 2010 | Interim Kyrgyz President Roza Otunbayeva called for the introduction of CSTO police units to southern Kyrgyzstan to stop ongoing violence. |
| June 2010 | Ethnic clashes broke out between Kyrgyz and Uzbeks in southern Kyrgyzstan, with interim President Roza Otunbayeva requesting Russian troop assistance. |
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