Sean Monaghan

Visiting Fellow, Europe, Russia and Eurasia Program
Sean Monaghan

Sean Monaghan is a visiting fellow in the Europe, Russia, and Eurasia Program at the Center for Strategic and International Studies, where he focuses on NATO, European security, and defense. His career as a civil servant in the UK Ministry of Defence has focused on international defense policy, including NATO, the European Union, and the United States. In recent years, his work as a policy analyst has seen him contribute to the United Kingdom's Integrated Review and lead multinational research projects.

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What Happened at NATO's Vilnius Summit?

While Ukraine’s bid for NATO membership captured most of the headlines of this year's NATO summit in Vilnius, the alliance took a range of decisions to strengthen deterrence, adapt for the future, and deepen global partnerships.

Critical Questions by Sean Monaghan Sissy Martinez Otto Svendsen Carlota García Encina and Mathieu Droin — July 14, 2023

Audio Briefs

“AUKUS Pillar Two”: Audio Brief with Sean Monaghan

A short, spoken-word summary from CSIS’s Sean Monaghan on his brief with John Christianson and Di Cooke, AUKUS Pillar Two: Advancing the Capabilities of the United States, United Kingdom, and Australia. 

Podcast Episode by Sean Monaghan — July 11, 2023

Audio Briefs

"Repel, Don’t Expel"

Russia's invasion of Ukraine radically changed NATO's security environment with the Baltic states being particularly exposed. NATO made bold commitments last year, and future summits need to ensure these commitments are fully implemented. 

Report by Mark F. Cancian and Sean Monaghan — July 6, 2023

What Will Happen at NATO’s Summit in Vilnius?

The NATO leaders’ summit in Vilnius arrives at a critical time as the war in Ukraine enters a critical phase and instability grows in Moscow—but what’s on the agenda for NATO in Vilnius?

Critical Questions by Sean Monaghan Sissy Martinez and Otto Svendsen — June 30, 2023

Press Briefing: Previewing the NATO Summit in Vilnius

The Center for Strategic and International Studies (CSIS) hosted a call-in press briefing on Thursday, June 29, at 11:00 a.m. EDT, to preview the upcoming NATO Summit in Vilnius, Lithuania, taking place on July 11 and 12.

Event — June 29, 2023