Siemon T. Wezeman

Senior Researcher

Siemon T. Wezeman

Siemon Wezeman is a Senior Researcher in the SIPRI Arms Transfers Programme. His areas of research include the monitoring of arms transfers, military spending and arms production, with particular focus on the Asia–Pacific and former Soviet Union, and the use of weapons in conflicts. He also researches military technology and transparency in arms transfers. Since 1992 he has worked in the SIPRI Arms Transfers Programme.

Subject expertise

Arms transfers; transparency in arms transfers; military technology; use of arms in conflicts; defence policies; methodology

CONTACT Siemon T. Wezeman

Citizenship

Netherlands

SIPRI COMMENTARY

Transfers of major arms to Afghanistan between 2001 and 2020 (Topical backgrounder, September 2021 )
Monitoring international arms transfers: The difficult case of production under licence (Blog, March 2021 )
Russia’s military spending: Frequently asked questions (Topical backgrounder, April 2020 )
China, Russia and the shifting landscape of arms sales (Topical backgrounder, June 2017 )
The state of major arms transfers in 8 graphics (Blog, February 2017 )

SIPRI AND PARTNER PUBLICATIONS

Wezeman, S. T., George, M. and Wezeman, P. D., Transparency in Armaments in South East Asia: Learning from Three Decades of the United Nations Register of Conventional Arms (SIPRI, Stockholm: February 2024)
Wezeman, P. D., Djokic, K., George, M., Hussain, Z. and Wezeman, S. T., Trends in International Arms Transfers, 2023 (SIPRI, Stockholm: March 2024)
Wezeman, P. D., Gadon, J. and Wezeman, S. T., Trends in International Arms Transfers, 2022 (SIPRI, Stockholm: March 2023)
Wezeman, P. D., Kuimova, A., Wezeman, S. T., Trends in International Arms Transfers, 2021 (SIPRI, Stockholm: March 2022)
Béraud-Sudreau, L., Liang, X., Wezeman, S. T. and Sun, M., Arms-production Capabilities in the Indo-Pacific Region: Measuring Self-reliance (SIPRI, Stockholm: October 2022)
Wezeman, P. D., Kuimova, A. and Wezeman, S. T., Trends in International Arms Transfers, 2020 (SIPRI, Stockholm: March 2021)
Tian, N., Kuimova, A., Lopes da Silva, D., Wezeman, P. D. and Wezeman, S. T., Trends in World Military Expenditure, 2019 (SIPRI, Stockholm: April 2020)
Béraud-Sudreau, L., Marksteiner, A., Lopes da Silva, D., Tian, N., Kuimova, A., Wezeman, P. D and Wezeman, S. T. , Mapping the International Presence of the World’s Largest Arms Companies (SIPRI, Stockholm: December 2020)
Wezeman, P. D., Fleurant, A., Kuimova, A., Lopes Da Silva, D., Tian, N. and Wezeman, S. T., Trends in International Arms Transfers, 2019(Stockholm: (March 2020)
Wezeman, P. D., Béraud-Sudreau, L. and Wezeman, S. T., Transparency in Arms Procurement: Limitations and Opportunities for Assessing Global Armament Developments (SIPRI, Stockholm: October 2020)
Trends in World Military Expenditure, 2018 (SIPRI, Stockholm: April 2019)
The SIPRI Top 100 Arms-producing and Military Services Companies, 2018 (SIPRI, Stockholm: December 2019)
Wezeman, S. T. , Arms Flows to South East Asia (SIPRI, Stockholm: December 2019)
Reporting to the United Nations Register of Conventional Arms for 2017 (June 2019)
Trends in International Arms Transfers, 2018 (March 2019)
Bulgaria and Black Sea Security (December 2018)
Georgia and Black Sea Security (December 2018)
Ukraine and Black Sea Security (December 2018)
The SIPRI Top 100 Arms-producing and Military Services Companies, 2017 (December 2018)
Russia and Black Sea Security (December 2018)
Romania and Black Sea Security (December 2018)
Turkey and Black Sea Security (December 2018)
Trends in International Arms Transfers, 2017 (SIPRI, Stockholm: March 2018)
Trends in World Military Expenditure, 2017 (SIPRI, Stockholm: May 2018)
Tian, N., Fleurant, A., Wezeman, P. D. et al., Trends in World Military Expenditure, 2016 (April 2017)
The SIPRI Top 100 Arms‑producing and Military Services Companies, 2016 (December 2017)
Fleurant, A., Wezeman, P. D., Wezeman, S. T. et al, Trends in International Arms Transfers, 2016 (February 2017)
Saalman, L. (ed.), Lukonin, S., Cheng, Y. et al., China–Russia Relations and Regional Dynamics: From Pivots to Peripheral Diplomacy (March 2017)
Perlo-Freeman, S., Fleurant, A., Wezeman, P. D. and Wezeman, S. T., Trends in World Military Expenditure, 2015 (April 2016)
Fleurant, A., Perlo-Freeman, S., Wezeman, P. D. et al, The SIPRI Top 100 Arms-producing and Military Services Companies, 2015 (December 2016)
Perlo-Freeman, S., Fleurant, A., Wezeman, P. D. and Wezeman, S. T., Trends in International Arms Transfers, 2015 (February 2016)
Wezeman, S. T., Military Capabilities in the Arctic: A New Cold War in the High North? (October 2016)
Trends in World Military Expenditure, 2014 (April 2015) 8 pp.
The SIPRI Top 100 Arms-producing and Military Services Companies, 2014 (December 2015) 8 pp.
Wezeman P. D. and Wezeman S. T., Trends in International Arms Transfers, 2014 (SIPRI, Stockholm: March 2015) 8 pp.
Trends in International Arms Transfers, 2013 (March 2014) 8 pp.
Holtom, P., Bromley, M., Wezeman, P.D. et al, Trends in International Arms Transfers, 2012 (March 2013) 8 pp.
Bromley, M. and Wezeman, S., Current trends in the international arms trade and implications for Sweden (October 2013) 32pp
Military Capabilities in the Arctic (March 2012) 16 pp.
Holtom, P., Bromley, M., Wezeman, P.D. et al, Trends in International Arms Transfers, 2011 (March 2012) 8 pp.
Arms Flows to Sub-Saharan Africa (December 2011) 49 pp.
Holtom, P., Bromley, M., Wezeman, P.D. et al, Trends in International Arms Transfers, 2010 (March 2011) 8 pp.
Israeli Arms Transfers to Sub-Saharan Africa (October 2011) 16 pp.
Holtom, P., Bromley, M., Wezeman, S. et al, Trends in International Arms Transfers, 2009 (March 2010) 8 pp.
International Transfers of Combat Aircraft, 2005–2009 (November 2010) 8 pp.
Holtom, P., Bromley, M., Wezeman, P.D. et al, SIPRI Arms Transfers Data, 2008 (April 2009) 8 pp.
Arms Transfers to Asia and Oceania (October 2009) 12 pp.
United Nations Arms Embargoes: Their Impact on Arms Flows and Target Behaviour (November 2007) 57 pp.
The Future of the United Nations Register of Conventional Arms2003) 41 pp.
Arms Watch: SIPRI Report on the First Year of the UN Register of Conventional Arms1993) 143 pp.

6. International arms transfers (Chapter, SIPRI Yearbook 2023)
10. Conventional arms control and regulation of new weapon technologies (Chapter, SIPRI Yearbook 2023)
13. Conventional arms control and regulation of new weapon technologies (Chapter, SIPRI Yearbook 2022)
9. International arms transfers (Chapter, SIPRI Yearbook 2022)
9. International arms transfers and developments in arms production (Chapter, SIPRI Yearbook 2021)
13. Conventional arms control and regulation of new weapon technologies (Chapter, SIPRI Yearbook 2021)
8. Military expenditure (Chapter, SIPRI Yearbook 2020)
9. International arms transfers and developments in arms production (Chapter, SIPRI Yearbook 2020)
4. Military expenditure (Chapter, SIPRI Yearbook 2019)
5. International arms transfers and developments in arms production (Chapter, SIPRI Yearbook 2019)
4. Military expenditure (Chapter, SIPRI Yearbook 2018)
5. International arms transfers and developments in arms production (Chapter, SIPRI Yearbook 2018)
10. International arms transfer and developments in arms production (Chapter, SIPRI Yearbook 2017)
9. Military expenditure (Chapter, SIPRI Yearbook 2017)
3. The Ukraine conflict and its implications (Chapter, SIPRI Yearbook 2015)
9. Military expenditure (Chapter, SIPRI Yearbook 2015)
10. International arms transfers and arms production (Chapter, SIPRI Yearbook 2015)
5. International arms transfers (Chapter, SIPRI Yearbook 2014)
5. International arms transfers (Chapter, SIPRI Yearbook 2013)
6. International arms transfers (Chapter, SIPRI Yearbook 2012)
6. International arms transfers (Chapter, SIPRI Yearbook 2011)
7. International arms transfers (Chapter, SIPRI Yearbook 2010)
7. International arms transfers (Chapter, SIPRI Yearbook 2009)
10. International arms transfers (Chapter, SIPRI Yearbook 2007)
Appendix 10C. Towards an arms trade treaty? (Chapter, SIPRI Yearbook 2007)
6. Transparency in the arms life cycle (Chapter, SIPRI Yearbook 2006)
10. International arms transfers (Chapter, SIPRI Yearbook 2006)
Appendix (Chapter, SIPRI Yearbook 2006)
10. International arms transfers (Chapter, SIPRI Yearbook 2005)
Appendix (Chapter, SIPRI Yearbook 2005)
12. International arms transfers (Chapter, SIPRI Yearbook 2004)
13. International arms transfers (Chapter, SIPRI Yearbook 2003)
8. International arms transfers (Chapter, SIPRI Yearbook 2002)
Appendix (Chapter, SIPRI Yearbook 2002)
5. Transfers of major conventional weapons (Chapter, SIPRI Yearbook 2001)
8. Transfers of major conventional weapons (Chapter, SIPRI Yearbook 1998)
9. The trade in major conventional weapons (Chapter, SIPRI Yearbook 1997)
11. The trade in major conventional weapons (Chapter, SIPRI Yearbook 1996)
14. The trade in major conventional weapons (Chapter, SIPRI Yearbook 1995)
13. Arms production and arms trade (Chapter, SIPRI Yearbook 1994)

External publications

Wezeman, S. T., ‘The global arms trade after the cold war’, A. T. H. Tan (ed.), The Global Arms Trade: A Handbook (Routledge, 2009)