Security & Defence
Strengthening national security, defence policy and resilience in a changing threat landscape.

An independent educational charity
Advancing public understanding of international security, diplomacy and the values that unite the Atlantic community.
Our purpose
The Atlantic Council of the United Kingdom is an independent, non-governmental charity dedicated to education, dialogue and international order.
We promote the principles of peace and cooperation enshrined in the North Atlantic Treaty. Through expert analysis, public events and an inclusive community, we help people understand the security questions shaping the United Kingdom and the wider world.
Explore our policy prioritiesWorking at the heart of the transatlantic conversation
Policy focus
Independent thinking and informed discussion across the most urgent questions in global affairs.
Strengthening national security, defence policy and resilience in a changing threat landscape.
Analysing global affairs and creating space for serious, constructive public dialogue.
Building stronger alliances and strategic relationships across the Atlantic community.
Atlantic Council discussion
Michael Reynolds and Russell examine when a drone strike, cyberattack or act of hybrid warfare could trigger NATO’s collective-defence commitment—and whether its members are prepared to respond without causing uncontrolled escalation.
Ideas become strongerA broad church
Lasting peace depends on an informed public and the confidence to hear different points of view.
We bring together established experts, emerging voices and people of every generation. By connecting government, civil society, business and academia, we make international affairs more accessible and encourage active participation in diplomacy and foreign policy.
“Democracy, human rights and the rule of law are not simply ideals. They are values we must actively protect.”
How we create impact
Our work connects informed thinking with the people and institutions shaping the future of the Atlantic community.
Clear, independent perspectives on security, diplomacy and international affairs — making complex issues accessible to a wider public.
Thoughtful conversations that bring established leaders, emerging voices and engaged citizens into the same room.
Helping the next generation develop the knowledge, networks and confidence to participate in international affairs.
New book launch
Michael Reynolds explores the diplomacy and dispute-resolution mechanisms used by statesmen and jurists during one of modern history’s most turbulent periods. The book follows Instruments of Peacemaking 1870–1914, examining pivotal crises settled through international arbitration and diplomacy—and the degree to which those efforts succeeded.
View book detailsCommunity in action
Conversations, events and lasting connections across generations.

Our principles
Independent thinking, honest analysis and transparent discussion.
A genuinely broad community spanning backgrounds, fields and generations.
Disagreement approached with curiosity, evidence and mutual respect.
Knowledge shared in pursuit of peace, security and the common good.
Get involved
Free
£3 / month
£3 / month
Join ACUK
Whether you are taking your first interest in international affairs or have spent a career shaping them, there is a place for you in our community.