Promise of International Organizational (IOs) Expansion: Rethinking the Expansion of Security IOs From a Multi-Dimensional Approach

Abstract

This study investigates the multidimensional expansion patterns of international security organizations (ISOs), analyzing both horizontal (membership enlargement, geographic reach, partnerships) and vertical (mandate expansion, governance reforms, operational capacity building) dimensions of growth. Through a comparative analysis of NATO, the Shanghai Cooperation Organization (SCO), and the Collective Security Treaty Organization (CSTO), the research reveals distinct expansion trajectories shaped by geopolitical contexts and institutional designs. NATO demonstrates comprehensive expansion across both dimensions, driven by its institutional flexibility and strategic adaptation. The SCO exhibits cautious horizontal growth coupled with selective functional vertical diversification, reflecting its consensus-based model. The CSTO, constrained by its regional focus and dominant power dynamics, shows limited horizontal expansion but incremental vertical development. The findings contribute to understanding how ISOs balance external pressures with internal capacities, offering insights into their evolving roles in global security governance.

Keywords

international organizations IO expansion multilateralism NATO CSTO SCO

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References

Abbott

K. W.

Green

J. F.

Keohane

R. O.

(2016). Organizational ecology and institutional change in global governance. International Organization, 70(2), 247–277. https://doi.org/10.1017/S0020818315000338

Allison

White

Light

(2005). Belarus between east and west. Journal of Communist Studies and Transition Politics, 21(4), 487–511. https://doi.org/10.1080/13523270500363411

Aris

(2011). The SCO’s model for regional cooperation: An institutional framework within the regional context of central Asia. In Eurasian regionalism: The shanghai cooperation organisation (pp. 20–53). Palgrave Macmillan UK.

AzarNews . (2024). Viktor vasilyev: Armenia did not transfer funds to CSTO budget for 2024. Azernews.Az. https://www.azernews.az/region/228594.html

Balding

Wehrenfennig

(2011). Theorizing international organizations: An organizational theory of international institutions. Journal of International Organizations Studies, 2(1), 7–27.

Barnett

Finnemore

(2004). The power of liberal international organizations. In Barnett

Duvall

(Eds.), Power in global governance (pp. 161–184). Cambridge University Press.

Barnett

M. N.

Finnemore

(1999). The politics, power, and pathologies of international organizations. International Organization, 53(4), 699–732. https://doi.org/10.1162/002081899551048

Basmat

(2025). Armenia refuses to finance Russian-led CSTO security alliance budget. The Kyiv Independent. https://kyivindependent.com/armenia-refuses-to-finance-contributions-russian-led-csto-security/

Bauer

M. W.

Eckhard

Ege

Knill

(2017). A public administration perspective on international organizations. In Bauer

Knill

Eckhard

(Eds.), International bureaucracy. Public sector organizations. Palgrave Macmillan. https://doi.org/10.1057/978-1-349-94977-9_1

10.

Becker

Duda

Lute

(2022). From context to concept: History and strategic environment for NATO’s 2022 strategic concept. Defence Studies, 22(3), 489–496. https://doi.org/10.1080/14702436.2022.2082959

11.

Benvenisti

Downs

G. W.

(2007). The empire’s new clothes: Political economy and the fragmentation of international law. Stanford Law Review, 60, 595–631.

12.

Brosig

Plank

Reykers

(2023). Governance through regime complexity: What role for the EU in the African security regime complex? Politics and Governance, 11(2), 72–83. https://doi.org/10.17645/pag.v11i2.6356

13.

Brown

R. L.

(2010). Measuring delegation. The Review of International Organizations, 5(2), 141–175. https://doi.org/10.1007/s11558-009-9076-3

14.

Buchanan

J. M.

(1965). An economic theory of clubs. Economica, 32(125), 1–14. https://doi.org/10.2307/2552442

15.

Chung

C. P.

(2006). China and the institutionalization of the shanghai cooperation organization. Problems of Post-Communism, 53(5), 3–14. https://doi.org/10.2753/PPC1075-8216530501

16.

CSTO . (2025). From the treaty to the organization. From the treaty to the organization. https://en.odkb-csto.org/25years/

17.

Debre

M. J.

Dijkstra

(2021). Institutional design for a post-liberal order: Why some international organizations live longer than others. European Journal of International Relations, 27(1), 311–339. https://doi.org/10.1177/1354066120962183

18.

Dijkstra

Debre

M. J.

(2022). The death of major international organizations: When institutional stickiness is not enough. Global Studies Quarterly, 2(4), ksac048. https://doi.org/10.1093/isagsq/ksac048

19.

Droesse

(2020). Membership in international organizations. In Membership in international organizations. T.M.C. Asser Press. https://doi.org/10.1007/978-94-6265-327-6_5

20.

Erkomaishvili

(2016). One for all, each on its own: Analysing the Post-Soviet system of collective security. Journal of Regional Security, 11(2), 81–110. https://doi.org/10.11643/issn.2217-995X162SPE60

21.

Fan

Kondakova

(2022). NATO and the SCO: Their conceptual foundations and implementation in the work of organizations. International Organisations Research Journal, 17(4), 124–147. https://doi.org/10.17323/1996-7845-2022-04-05

22.

Fleishman

Campbell

Braithwaite

(2025). Who is the IO? IOs as intermediaries in aid networks. In The political economy of international organization (pp. 1–35). Harvard University.

23.

German

(2017). NATO and the enlargement debate: Enhancing euro-atlantic security or inciting confrontation? International Affairs, 93(2), 291–308. https://doi.org/10.1093/ia/iix017

24.

Graham

E. R.

(2015). Money and multilateralism: How funding rules constitute IO governance. International Theory, 7(1), 162–194. https://doi.org/10.1017/S1752971914000414

25.

Gray

(2020). Life, Death, Inertia, Change: The Hidden Lives of International Organizations. Ethics & International Affairs, 34(1), 33–42. https://doi.org/10.1017/S0892679420000052

26.

Gray

Lindstädt

Slapin

J. B.

(2017). The dynamics of enlargement in international organizations. International Interactions, 43(4), 619–642. https://doi.org/10.1080/03050629.2017.1228039

27.

Gutner

Thompson

(2010). The politics of IO performance: A framework. The Review of International Organizations, 5(3), 227–248. https://doi.org/10.1007/s11558-010-9096-z

28.

Haftel

Y. Z.

Lenz

(2017). Regional governance. In Cogan

(Ed.), The Oxford handbook of international organizations (pp. 323–347). Oxford University Press.

29.

Haftel

Y. Z.

Thompson

(2018). When do states renegotiate investment agreements? The impact of arbitration. The Review of International Organizations, 13(1), 25–48. https://doi.org/10.1007/s11558-017-9276-1

30.

Hasnat

S. F.

Awan

(2016). Shanghai cooperation organization as a platform for regional understanding: Its economic, political and security potential. Perceptions: Journal of International Affairs, 21(1), 83–100. https://doi.org/10.52837/27382702-2021-34.2-08

31.

Heldt

Schmidtke

(2017). Measuring the empowerment of international organizations: The evolution of financial and staff capabilities. Global Policy, 8(Suppl 5), 51–61. https://doi.org/10.1111/1758-5899.12449

32.

Hofmann

S. C.

Andreska

Burai

Uribe

(2023). Porous organizational boundaries and associated states: Introducing member ness in international organizations. European Journal of International Relations, 29(4), 929–959. https://doi.org/10.1177/13540661231163988

33.

Hofmann

S. C.

Staeger

(2020). Frame contestation and collective securitisation: The case of EU energy policy. In Collective securitisation and security governance in the european union (pp. 97–119). Routledge.

34.

Horta

(2008). The Shanghai cooperation organization (SCO): An Asian NATO? Asia Pasific: Perspectives, 8(1), 30–36. https://www.pacificrim.usfca.edu/research/perspectives

35.

Hussain

Mahrukh

Saleem

(2022). Study of Russian security activities in central Asia under collective security treaty organization. Journal of Development and Social Sciences, 3(3), 186–193. https://doi.org/10.47205/jdss.2022(3-III)19

36.

Jaffer

(2016). The first enlargement of Shanghai cooperation organization and its implications. Regional Studies, 36(2), 65–93. https://www.irs.org.pk/focus/focus-1-16.pdf

37.

Karami

(2023). The strategic role of Iran for the SCO: Strengthening Eurasian integration. Vestnik RUDN. Vestnik RUDN. International Relations, 23(3), 547–561. https://doi.org/10.22363/2313-0660-2023-23-3-547-561

38.

Keohane

R. O.

(1984). After hegemony: Cooperation and Discord in the world political economy. Princeton University Press. https://doi.org/10.2307/j.ctt7sq9s

39.

Lukin

Novikov

Puzanova

Yenikeyeff

(2025). The Shanghai cooperation organization amidst the rising international tensions. Journal of Eurasian Studies, 16(2), 173–183. https://doi.org/10.1177/18793665251357320

40.

Lynch

E. A.

Helms

(2024). The Shanghai cooperation organization. Military Review, 1(1), 26–36.

41.

MacHaffie

(2021). Mutual trust without a strong collective identity? Examining the Shanghai cooperation organization as a nascent security community. Asian Security, 17(3), 349–365. https://doi.org/10.1080/14799855.2021.1895115

42.

Matthijs

(2015). The funding of the NATO. Journal of Power, Politics & Governance, 3(1), 47–62. https://doi.org/10.15640/jppg.v3n1a3

43.

Mattli

Plümper

(2002). The demand-side politics of EU enlargement: Democracy and the application for EU membership. Journal of European Public Policy, 9(4), 550–574. https://doi.org/10.1080/13501760210152439

44.

Megens

(1998). The role of NATO’s bureaucracy in shaping and widening the north Atlantic treaty organization. In Bob reinalda and bertjan verbeek (pp. 120–133). Routledge.

45.

Michta

A. A.

(2009). NATO enlargement post-1989: Successful adaptation or decline? Contemporary European History, 18(3), 363–376. https://doi.org/10.1017/S0960777309005098

46.

Najam

(2025). NATO at 75: Evolution, expansion, and strategic implications for global security. Journal of European Studies (JES), 41(2), 17–34. https://doi.org/10.46568/jes.v41i2.392

47.

NATO . (1991). The Alliance’s 1991 strategic concept. NATO. https://www.nato.int/cps/en/natohq/official_texts_23847.htm

48.

NATO . (1999). The Alliance’s 1999 strategic concept. NATO. https://www.nato.int/cps/en/natohq/official_texts_27433.htm

49.

NATO . (2006). Part III: NATO’s civilian and military structures. NATO.

50.

NATO . (2010). Active engagement, modern defence - NATO 2010 strategic concept. NATO. https://www.nato.int/cps/en/natohq/official_texts_68580.htm

51.

NATO . (2022). NATO 2022 strategic concept. NATO. https://www.nato.int/cps/en/natohq/topics_210907.htm

52.

NATO . (2025). Funding NATO. NATO. https://www.nato.int/cps/en/natohq/topics_67655.htm

53.

Parízek

(2016). Control, soft information and the politics of international organizations staffing. The Review of International Organizations, 12(4), 1–25. https://doi.org/10.1007/s11558-016-9252-1

54.

Pechous

E. J.

(2008). NATO enlargement and beyond. Connections: The Quarterly Journal, 7(2), 54–66. https://doi.org/10.11610/Connections.07.2.05

55.

Plater-Zyberk

Monaghan

(2014). Strategic implications of the evolving Shanghai cooperation organization. United States Army War College.

56.

Raustiala

Victor

D. G.

(2004). The regime complex for plant genetic resources. International Organization, 58(2), 277–309. https://doi.org/10.1017/S0020818304582036

57.

Rozanov

Dovgan

E. F.

(2010). Collective security treaty organisation. In Douhan

A. F.

Rusakovich

A. V.

(Eds.), Collective security treaty organisation. The Geneva Centre for the Democratic Control of Armed Forces.

58.

Rynning

(2005). NATO renewed: The power and purpose of transatlantic cooperation. Palgrave Macmillan.

59.

Sakwa

(2010). Senseless dreams and small steps: The CIS and CSTO between integration and cooperation. In Raquel Freire

Kanet

R. E.

(Eds.), Key players and regional dynamics in Eurasia: The return of the ‘Great Game’ (pp. 195–214). Palgrave Macmillan.

60.

Schimmelfennig

(2001). The community trap: Liberal norms, rhetorical action, and the eastern enlargement of the European union. International Organization, 55(1), 47–80. https://doi.org/10.1162/002081801551414

61.

Schimmelfennig

Sedelmeier

(2005). The politics of EU enlargement: Theoretical and comparative perspectives. In The politics of European union enlargement (pp. 19–46). Routledge.

62.

SCO . (2001). Documents. Shanghai Cooperation Organisation. https://eng.sectsco.org/documents/?offset=110

63.

SCO . (2023). General information. Shanghai Cooperation Organisation. https://eng.sectsco.org/20170109/192193.html

64.

SCO . (2024). Frequently asked questions. The Shanghai cooperation organisation. https://eng.sectsco.org/20231127/1168690.html

65.

Smith

(2021). Promoting integrity in the work of international organisations. Springer International Publishing. https://doi.org/10.1007/978-3-030-73916-4

66.

Stratievski

(2023). Why the CSTO failed to become Russia’s NATO. Friedrich Ebert Stiftung.

67.

Szenes

Igibayeva

(2024). The collective security treaty organization. In International security organisations (pp. 155–172). Ludovica University Press.

68.

UK Parliament . (2008). House of commons - Hansard - UK parliament. NATO. https://hansard.parliament.uk/commons

69.

Vabulas

Snidal

(2021). Organization without delegation: Informal intergovernmental organizations (IIGOs) and the spectrum of intergovernmental arrangements. The Review of International Organizations, 16(2), 275–303. https://doi.org/10.1007/s11558-012-9161-x

70.

Wallander

C. A.

(2000). Institutional assets and adaptability: NATO after the cold war. International Organization, 54(4), 705–735. https://doi.org/10.1162/002081800551343

71.

Weitz

(2018). Assessing the collective security treaty organization: Capabilities and vulnerabilities. US Army War College. https://press.armywarcollege.edu/monographs/390

72.

Xue

Makengo

B. M.

(2021). Twenty years of the Shanghai cooperation organization: Achievements, challenges and prospects. Open Journal of Social Sciences, 9(10), 184–200. https://doi.org/10.4236/jss.2021.910014

73.

Zehra

(2024). Role of SCO in countering non-traditional security threats in SCO region. Pakistan JL Analysis & Wisdom, 3(93), 160–169. https://doi.org/10.55737/qjssh.vi-iii.25400. https://pjlaw.com.pk.

74.

Zhao

(2020). The role of international organizations in preventing conflicts between the SPS agreement and the cartagena protocol on biosafety. Review of European, Comparative & International Environmental Law, 29(2), 271–281. https://doi.org/10.1111/reel.12326