Security

The security environment surrounding Japan is becoming increasingly challenging. Key factors include a full-blown strategic competition between the US and China, an unstoppable maritime expansion by China, the opaque future of denuclearization on the Korean Peninsula, the deepening confrontation between China and Taiwan, and ongoing tensions in the Strait of Hormuz. Domestic issues such as the US military base presence in Okinawa and Japan’s declining birthrate and aging population, as well as technological innovations that are changing the nature of warfare are also having a significant impact on Japan's security.

In response to these multifaceted challenges, JIIA is conducting cutting-edge research on the state of Japan's security and issues related to the Japan-US alliance. We are also actively promoting international cooperation and addressing sensitive challenges through dialogue with researchers from around the world.

Related Study Groups
Study Group on Traditional Security Risks
Study Group on Risks in New Domains (Space, Cyberspace, etc.)
Study Group on Economic Security and Japanese Diplomacy in an Era of International Competition

Event Reports

#Event Reports #Security#Europe

“Securing Subsea Cables and Critical Infrastructure: Lessons from the Baltic Sea”

28.04.2026
#Event Reports #Japan#Indo-Pacific#Europe#Security

Report on an Event Featuring H.E. Radmila Shekerinska, NATO Deputy Secretary General

16.03.2026
#Event Reports #Japan#Indo-Pacific#Europe#Security

Report on a Roundtable with Think Tanks in the Netherlands and Norway and Participation in the Annual Conference of a Lithuanian Think Tank

16.03.2026
#Event Reports #Indo-Pacific#Security #JIIA Center for Global Outreach (CGO) #The Center for Territory and History

International Symposium: “Safeguarding the Maritime Domain for the Free and Open Indo-Pacific”

10.03.2026
#Event Reports #Europe#Security #CDAST #CTBT #Science and Technology #Disarmament / Non-proliferation

3rd Webinar Towards a World without Nuclear Weapons: The International Group of Eminent Persons for a World without Nuclear Weapons (IGEP)

25.02.2026
#Event Reports #Security#China#Indo-Pacific#Americas #Center for Disarmament, Science and Technology (CDAST) #Disarmament / Non-proliferation #Economic Security #Science and Technology #CDAST

CDAST Roundtable on U.S.-China Nuclear and Strategic Issues

19.01.2026

Research Findings

#Korean Peninsula#Russia, Central Asia & the Caucasus#China#Security #Strategic Outlook (formerly Strategic Annual Report) #Strategic Outlook 2026

Chapter 4: The Korean Peninsula: The ROK and North Korea Seek to Expand Their “Survival Space” Amid Unrest in the International Order

Tomoki Iimura (Research Fellow, The Japan Institute of International Affairs)
18.05.2026
#Indo-Pacific#Security #Research Projects and Outcomes #Study Group on Traditional Security Risks

“Traditional Security in the Indo-Pacific” Project Final Report

18.05.2026
#Security #JIIA Strategic Comments #CTBT #CDAST #Science and Technology #Disarmament / Non-proliferation #Center for Disarmament, Science and Technology (CDAST)

JIIA Strategic Comments (2026-14) Preserving the Nuclear Test Moratorium at the NPT Review Conference

Mao Takahata (Research Fellow, The Japan Institute of International Affairs)
12.05.2026
#Japan#Security #Japan's Voices #JIIA Center for Global Outreach (CGO)

[Japan’s Voices No.7] At a Time of Nuclear Uncertainty: An Interview with Izumi Nakamitsu

Izumi Nakamitsu (UN Under-Secretary-General and High Representative for Disarmament Affairs)
17.04.2026
#Japan#China#Americas#Security #Strategic Outlook 2026 #JIIA Strategic Comments

Chapter 1: US Strategic Restraint and Japan’s Security

Tetsuo Kotani (Chief Research Fellow, The Japan Institute of International Affairs/Professor, Meikai University)
07.04.2026
#Indo-Pacific#Japan#Security#Economy & Global Issues #Japan's Voices #JIIA Center for Global Outreach (CGO)

[Japan’s Voices No.6] Safeguarding Maritime Security in the Indo-Pacific : Challenges and Prospects for Maritime Security Cooperation between Japan and Southeast Asia

Tomohisa Takei (Adjunct Fellow, The Japan Institute of International Affairs)
27.03.2026