About Collective Security Treaty Organisation
- It is an intergovernmental military alliance in Eurasia, which was established in 2002.
- Members of the organization at present are: Russia, Armenia, Belarus, Kazakhstan, Kyrgyzstan, and Tajikistan.
- Background
- The Collective Security Treaty (CST) was signed on May 15, 1992 in Tashkent by the Heads of six countries:Â Armenia, Kazakhstan, Kyrgyzstan, Russia, Tajikistan and Uzbekistan. Subsequently, Azerbaijan, Georgia and Belarus joined it.
- The treaty came into force on April 20, 1994.
- On May 14, 2002, in Moscow, the Collective Security Council made a decision to grant the status of an international regional organization to the Collective Security Treaty.
- In 2004 the UN General Assembly adopted a resolution granting the Collective Security Treaty Organization (CSTO) an observer status in the UN General Assembly.
- The statutory bodies of the Organization are: the Collective Security Council (CSC), the Council of Foreign Ministers (COM), the Council of Ministers of Defense (CIO), the Committee of Secretaries of Security Council (CSSC).
- The key objectives of the CSTO include
- The provision of national and collective security, intensive politico-military cooperation, foreign policy coordination on international and regional security issues, the establishment of multilateral cooperation mechanisms, including a military component, the development of cooperation in the counteraction to modern challenges and security threats.
- Headquarter: Moscow, Russia
Q1) What is NATO?
It was formed in 1949 with the signing of the Washington Treaty, NATO is a security alliance of 31 countries from North America and Europe. Its fundamental goal is to safeguard the Allies’ freedom and security by political and military means.
Source: Armenia freezes participation in Russia-led security bloc – Prime Minister
Last updated on August, 2026
→ UPSC Mains 2026 will be conducted on 21st, 22nd, 23rd, 29th and 30th August 2026.
→ Check out the latest UPSC Syllabus 2026 here.
→ UPSC Mains Admit Card 2026 is expected to be released in early August at upsc.gov.in or upsconline.nic.in
→ Enroll in Vajiram & Ravi’s UPSC Mains Test Series 2027 for structured answer writing practice, expert evaluation, and exam-oriented feedback.
→ Join Vajiram & Ravi’s UPSC Mentorship Program 2027 for personalized guidance, strategy planning, and one-to-one support from experienced mentors.
→ Go through the UPSC Mains Previous Year Papers to enhance your preparation.
→ Download UPSC Mains Essay Paper 2025, UPSC Mains GS Paper-I 2025, UPSC Mains GS Paper-II 2025, UPSC Mains GS Paper-III 2025, UPSC Mains GS Paper-IV 2025, UPSC Mains English (Compulsory) Paper 2025, UPSC Mains Hindi (Qualifying) Paper 2025 here.
→ UPSC has released UPSC Toppers List 2025 with the Civil Services final result on its official website.
→ UPSC Calendar 2027 has been released.
→ Also check Best UPSC Coaching in India







