CSIS Defense and Security Department

The CSIS Defense and Security Department (DSD) is a constant source of reliable analysis on the threats and opportunities shaping U.S. security interests.

[CSIS Missile Defense @Missile_Defense]

Satellites can be replaced quickly—but not if the launch site is targeted first.

In a recent episode of HTK with Kari Bingen and @heatherwilly, @tomkarako explained why real space resilience means defending launch infrastructure, not just replacing what's already gone.

[CSIS @CSIS]

Purchasing foreign-built ships is the fastest & most economical means of expanding the U.S. naval fleet. This would especially be the case with auxiliary & support vessels, which feature less-sensitive technologies than surface combatants.

Read more from @csisdefense: https://t.co/lEidjZb6jb

[CSIS @CSIS]

ICYMI | The Honorable Mike Obadal and the Honorable Ryan D. McCarthy joined @McGinnJerry for a discussion on the enduring importance of U.S. land power within an increasingly complex global security environment.

Watch: https://t.co/0GDLw5i5uF

[CSIS Missile Defense @Missile_Defense]

First take out the critical nodes with exquisite firepower, then close in and overwhelm with affordable mass.

In a conversation with @tomkarako, LTG Frank Lozano, PAE Fires, detailed his vision for a 60/40 low-cost to high-end mix across the missile and munitions portfolio.

[Tom Karako @tomkarako]

My @CSIS colleague Mark Cancian and I sat down today to discuss the implications of the massive expenditure of offensive and defensive missiles in Operation Epic Fury.

https://t.co/fIyFrfuL5x

[CSIS @CSIS]

U.S. forces fired many air defense munitions during the first phase of Operation Epic Fury. Mark Cancian, Senior Advisor with @CSISDefense, joined @NewsCentralCNN this morning to discuss recent analysis on expended munitions.

Learn more: https://t.co/vFLp0Dbsik

[CSIS @CSIS]

Although China still faces constraints in profitability, launch maturity, and international trust, the broader trajectory is clear: Beijing is positioning itself to become a dominant space power.

Learn more from @CSISAerospace: https://t.co/eaKLVGJEMR

[CSIS @CSIS]

"There is no more important bilateral air and missile defense cooperative relationship than that between the U.S. & Japan," @tomkarako argues in his latest op-ed for @BreakingDefense.

Read about the possible paths forward in this critical moment: https://t.co/tqvULCRQrg

[CSIS @CSIS]

With the Mogami frigate sale to Australia and the end of decades-old restrictions, Tokyo's manufacturers are entering the world market as both partner and rival to allied producers — a tension Washington and its friends must now learn to manage.

Read more from @CSISDefense experts: https://t.co/tkwTRsFhlj

[CSIS @CSIS]

In a tabletop exercise, members of Congress faced Red Kraken, an AI agent trained to emulate Beijing. @CSISDefense experts examine how China could target ports and logistics to delay U.S. mobilization and argue for AI-enabled gaming to strengthen cyber defenses.

Read: https://t.co/zsK0m9NHFP

[CSIS @CSIS]

"Iran wants to remind the world that it can shut down the Strait of Hormuz any time it chooses and signal that time is in its favor. It wants to use that leverage to get the most favorable terms possible," writes @EmilyHardingDC.

Why do the U.S. and Iran keep fighting while they negotiate? https://t.co/J0M6TvhiSX

[CSIS @CSIS]

This week, @csisfutures hosted a wargame with a bipartisan group of members from @HomelandGOP, @HomelandDems and @ChinaSelect to help policymakers prepare for a potential AI-enabled cyberattack on the United States.

Watch the opening remarks: https://t.co/umUIqLLWMJ

[CSIS @CSIS]

ICYMI | On the latest episode of The Last Line of Defense, @SethGJones and Mick Ryan, retired Australian Army Major General, examined the current state of the Ukraine war, the use of AI and drone warfare, and the conditions of Russia’s frontlines.

Watch: https://t.co/sQP59wAzNM

[Mick Ryan, AM @WarintheFuture]

In this new conversation with Seth Jones on the @CSIS Last Line of Defense podcast, we discuss whether Ukraine is winning as well as drone warfare, the use of AI and the ongoing adaptation battle. https://t.co/0k2J0qpxZ1

[CSIS @CSIS]

Is Ukraine winning? @WarintheFuture, retired Australian Army Major General, joins @SethGJones on the Last Line of Defense to discuss the Ukrainian air campaign, the use of AI and drone warfare, and the conditions of Russia’s frontlines.

Listen: https://t.co/fa1C5ejJuo

[CSIS @CSIS]

Ukrainian drones and artillery are inflicting massive casualties on Russian troops on the front lines. With the Russian advance effectively stalled, the Ukrainians have also found ways to strike deep inside Russian territory.

Read more from @CSISDefense's @SethGJones and @rileydmccabe: https://t.co/S8G6jn1bIy

[CSIS @CSIS]

The United States just ran its biggest-ever test of counter-drone defense during the 2026 World Cup, seizing over 500 drones.

Will this counter-drone playbook be carried forward permanently? Read more from @CSISAerospace:
https://t.co/l0Bk3GYA3u

[CSIS @CSIS]

Russia has lost the military initiative in Ukraine as costs continue to mount. The Russian military has suffered 1.4 million battlefield casualties and as many as 450,000 deaths since its February 2022 full-scale invasion, according to new @CSISDefense data.

Learn more: https://t.co/us8TTjlkF4

[CSIS @CSIS]

LIVE NOW | Join @CSISDefense and Lieutenant General Frank Lozano for a Strategic Landpower Dialogue exploring the Army's acquisition modernization, Joint Force & coalition interoperability, and the future of U.S. landpower.

Join: https://t.co/JHzG29RJ3L

[CSIS @CSIS]

About one-third of the White House’s $87.6 billion supplemental request is driven by costs related to the Iran war. Yet some war costs will have to be covered by other budget mechanisms, writes CSIS's Mark Cancian and Chris Park.

Read: https://t.co/yWXtnaFByN