Research reports and analysis

Tianran Xu
Jaewoo Shin
Elin Bergner
September 12, 2023

Nuclear Risk Assessment Report - August 2023

In an attempt to more comprehensively assess nuclear risks on and around the Korean Peninsula, this monthly Report examines the DPRK’s and the ROK’s nuclear and military spheres, as well as activities and policy decisions across main domestic and foreign policy spheres that could impact nuclear risk...
Tianran Xu
Jaewoo Shin
Elin Bergner
August 10, 2023

Nuclear Risk Assessment Report - July 2023

In an attempt to more comprehensively assess nuclear risks on and around the Korean Peninsula, the Report examines the DPRK’s and the ROK’s nuclear and military spheres, as well as activities and policy decisions across main domestic and foreign policy spheres that could impact nuclear risks.
Tianran Xu
August 08, 2023

Brief on 27 July 2023 Parade of the DPRK

Strategic Delivery Vehicle Developments Series
To celebrate the 70th "Victory Day" (Korean War armistice) anniversary, the Democratic People’s Republic of Korea (DPRK) staged a military parade on 27 July 2023, which was centered around the DPRK’s nuclear forces.
Pavel Podvig
Eleanor Krabill
Vivienne Zhang
Eric Lepowsky
Manuel Kreutle
Christoph Wirz
Alexander Glaser
Jaewoo Shin
Veronika Bedenko
July 31, 2023

Menzingen Verification Experiment

Verifying the Absence of Nuclear Weapons in the Field
The Menzingen Verification Experiment conducted on 8 March 2023, was organized by UNIDIR in partnership with the Swiss Armed Forces, Spiez Laboratory, Princeton University’s Program on Science and Global Security, and ONN. This report describes the procedure and the key results of the experiment.
Tianran Xu
Jaewoo Shin
Elin Bergner
July 12, 2023

Nuclear Risk Assessment Report - June 2023

In an attempt to more comprehensively assess nuclear risks on and around the Korean Peninsula, this monthly Report examines the DPRK’s and the ROK’s nuclear and military spheres, as well as activities and policy decisions across main domestic and foreign policy spheres that could impact nuclear risk...
Tianran Xu
June 29, 2023

Size Estimates of DPRK's Nuclear Devices

The DPRK nuclear warheads showcased before 2023 have a maximum diameter of around 600 mm and were likely intended to be delivered by ballistic missiles. The Hwasan-31 nuclear warhead, newly revealed in late March 2023, has a reduced diameter of around 460 mm, suggesting advances in miniaturization. ...