CSTO 6 members
CSTO has 6 members; together, today’s CSTO members had 2.4% of the world’s people and 2.6% of its GDP in 2025.
Source: Membership: the groupings’ own member listsMembers as of 10 Nov 2026
Source: World Bank Indicators2025
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Summary
The Collective Security Treaty Organization: a military alliance of former Soviet states, based on a 1992 treaty.
Today’s CSTO members account for 2.4% of the world’s people (2025), 2.6% of the world’s GDP (2025), 6.9% of the world’s military spending (2025) and 5.8% of the world’s CO2 emissions (2024). Together they mine 43% of the world’s palladium, 5.2% of the world’s tungsten and 5.1% of the world’s nickel (USGS, 2025, estimated). Of its members, 6 are also in the CIS, 5 in the SCO, 5 in the Eurasian Economic Union and 2 in OPEC+.
Membership is as each grouping lists it. A grouping’s share of the world adds up its members’ figures, against the sum for every country with a figure.
Source: Membership: the groupings’ own member lists; World Bank; Global Carbon Budget; FAOSTAT; USGSMembers as of 10 Nov 2026
Members
| Russia | 144 m | 74% | $2.56 tn | BRICS, G20, OPEC+, SCO, APEC, UN Security Council (permanent), Eurasian Economic Union, CIS |
|---|---|---|---|---|
| Kazakhstan | 21 m | 11% | $306 bn | OPEC+, SCO, Eurasian Economic Union, CIS |
| Tajikistan | 11 m | 5.5% | $18 bn | SCO, CIS |
| Belarus | 9.1 m | 4.7% | $93 bn | SCO, Eurasian Economic Union, CIS |
| Kyrgyzstan | 7.3 m | 3.8% | $23 bn | SCO, Eurasian Economic Union, CIS |
| Armenia1 | 3.1 m | 1.6% | $29 bn | Eurasian Economic Union, CIS |
Source: Membership: the groupings’ own member lists; World BankMembers as of 10 Nov 20262025
Notes
- Armenia: Armenia froze its participation in 2024 but has not left.