International Security & Defense

Europe after the Russo-Ukrainian War must develop a new security structure to defend against any Russian aggression. The safest option is a non-offensive, confidence-building defense. This option includes proposals such as the “spider in the web” strategy and the “porcupine” strategy to provide for European security in a region threatened by Russian expansion—without relying on the threat of nuclear war. 

The non-Soviet members of the Warsaw Pact contributed to the end of the Cold War along with the superpowers. These Eastern European states recognized that their relationship with the Soviet Union would impede their success in the post–Cold War world, so they ended the Pact.

Matthew Evangelista examines the precedents and possibilities for postwar European security.

Stephen Walt writes that the differences in foreign policy will be less significant than one may think. Consider how Trump and Biden would each likely deal with the three most important items on the current foreign-policy agenda: Ukraine, China, and the Middle East.

Stephen Walt elaborates on what he is expecting for 2024:  the Israel-Gaza conflict widening, the 75th anniversary of NATO, the possible re-election of Donald Trump, and the election results from other populous democracies, to name a few.

This piece is a series in the Defense, Emerging Technology, and Strategy (DETS) Program’s analysis on the war in Ukraine, including a corresponding policy brief on Ukraine’s Battlefield Technologies and Lessons for the U.S. published in July 2023. 

Stephen Walt argues that Henry Kissinger's concerns about the destabilizing impact of ideas made him hypersensitive to the smallest perturbations in strategically marginal countries and inclined him to overreact to them in ways that other realists opposed.

On October 30, 2023, President Biden issued the Executive Order on the Safe, Secure, and Trustworthy Development and Use of Artificial Intelligence, aimed at realizing the benefits of AI, while mitigating critical risks. This article provides an overview of its key national security initiatives and explores issues relevant to implementation.

For Ukraine to maintain its defense and decisively thwart Russia’s invasion, it will take steadfast commitments from Western allies providing both state-of-the-art equipment and basic warfighting needs, local industry leaders and factory workers readying equipment for the frontlines and developing innovative technologies, and civilian volunteers tirelessly filling in the remaining gaps.

Stephen Walt analyzes the costs and benefits of forming alliances. When powerful and stable states face the same threats that the United States does, forming an alliance with them makes good sense. Adding weak and vulnerable members to an alliance may not strengthen it, and long-standing partnerships become less effective if some members let their own military capabilities languish. Another problem with the overzealous pursuit of new partners is the possibility that their agendas will be incompatible with those of the United States.