The week of March 24, 2025, was a busy one on the Hill. On March 25 and 26, senior intelligence leaders testified before the Senate and House intelligence committees, respectively, on the Intelligence Community’s annual threat assessment. Also on March 26, the commanders of U.S. Strategic Command and U.S. Space Command testified before the Senate Armed Service Committee discussing “accelerating threats” and the posture and capabilities needed by each command to execute their national security missions.China and Russia are pursuing “game changing threats,” including unprecedented space advancements, novel missile systems, and nuclear force expansion. Iran and North Korea continue to enlarge their nuclear, missile, and space programs, while likely gaining technology benefits from Russia in return for arming it against Ukraine. All of these threat trends have implications for U.S. strategic forces capabilities – space defenses, nuclear force structure, air and missile defenses, including the recently announced Golden Dome initiative, and electromagnetic spectrum operations. What are the most significant changes in the threat environment over the last year, what are the implications for U.S. strategic forces and U.S. defense initiatives in space, nuclear, and missile defense policy? How can the United States maintain its technological and industrial competitiveness in these areas? Please join the CSIS Defense and Security Department for a conversation on these topics featuring Kari A. Bingen, director of the CSIS Aerospace Security Project, Dr. Heather Williams, director of the CSIS Project on Nuclear Issues, and Dr. Tom Karako, director of the CSIS Missile Defense Project.