Analysis / ReportGame On: Opportunities for Euro-Atlantic Strategic Stability and Arms ControlByHeather Williams, Nicholas Adamopoulos, Lachlan Mackenzie and Catherine MurphyPublished Apr 23, 2025Europe is likely to remain a theater of instability despite pressure for a peace settlement in Ukraine. As the United States shifts toward the Indo-Pacific and Russia continues to pursue its territorial ambitions, what might arms control look like after the war in Ukraine?
Analysis / Next Gen CommunityHow a Second Trump Term Could Shape U.S. Nuclear Posture in Europe and the Indo-Pacific ByMariam KvaratskheliaPublished Apr 10, 2025The early days of Trump’s second term have been marked by statements signaling a departure from his first-term nuclear doctrine—but geopolitical realities in two key theaters and potential congressional pushback are likely to limit the extent of that pivot.
Analysis / CommentaryCSIS European Trilateral Track 2 Nuclear DialoguesByHeather WilliamsPublished Apr 9, 2025Political shifts and a rapidly changing security environment continue to reinforce the importance of close collaboration and unity between the United States, the United Kingdom, and France as responsible nuclear weapons states and NATO alliance members.
Analysis / CommentaryCan France and the United Kingdom Replace the U.S. Nuclear Umbrella?ByDoreen Horschig and Astrid ChevreuilPublished Mar 13, 2025As doubts grow over U.S. nuclear commitments, Germany’s new chancellor has sparked debate on whether France and the United Kingdom could provide a European nuclear umbrella. But with strategic and doctrinal hurdles ahead, is Europe ready to reshape its nuclear deterrence?
Analysis / CommentaryEscalation as a Path to Peace: Risk Tolerance and Negotiations in UkraineByLachlan MackenziePublished Jan 3, 2025The incoming President Donald Trump has made achieving a rapid, negotiated settlement to the war in Ukraine a cornerstone of his foreign policy agenda. It is not clear, however, that the Kremlin sees a need to offer concessions.
Analysis / Next Gen CommunityThe GIUK Gap: A New Age of A2/AD in Contested Strategic Maritime Spaces ByShane WardPublished Sep 12, 2024The global strategic environment is ripe for technology-driven great power competition once more. Russia’s war in Ukraine and pursuit of novel nuclear weapon delivery vehicles, coupled with China’s expanding nuclear arsenal and capabilities, mean the United States must assess its capabilities and posture in more theaters simultaneously than ever before. Among them, contested maritime spaces…
Analysis / CommentaryEurope Needs More Conventional Forces, Not Its Own NukesByDoreen Horschig and Sean MonaghanPublished Jul 31, 2024The U.S. election has renewed debate about an independent European nuclear force. Yet this distracts from the real European defense issue: a lack of conventional combat power. Europe’s main task remains the same as during the Cold War: strengthen conventional deterrence.
Analysis / ReportUnderstanding Opportunistic Aggression in the Twenty-First CenturyByKelsey Hartigan, Reja Younis and Lachlan MackenziePublished Jul 31, 2024The United States faces an increasingly contested strategic environment that raises significant, unanswered questions about the role nuclear weapons will play in U.S. national security strategy going forward, and the forces that will be required to deter—and, if necessary, defeat—adversaries. For the first time in its history, the United States must contend with not one…
Analysis / Next Gen CommunityThe ceaseless return of the Eurodeterrent debate: Focusing on the right questionByLinde DesmaelePublished May 1, 2024While the concept of a European nuclear deterrent is by most deemed ill-advised, it also stems from a deeper unease: How to navigate a world where Russia appears increasingly aggressive and the United States more unpredictable. Rather than hastily pursuing nuclear alternatives, European leaders must define their Russia problem first.
Analysis / ReportThe Long Shadow: Russian Nuclear Calibration in the War in UkraineByHeather Williams, Kelsey Hartigan, Lachlan Mackenzie and Reja YounisPublished Feb 23, 2024How have Russia’s nuclear narratives evolved over the course of the war in Ukraine? To address this question and evaluate future nuclear risks, the CSIS Project on Nuclear Issues conducted a study on Russian nuclear signaling during the first 18 months of the war.