Nuclear Issues

The Memorandum on Security Assurances in Connection with Ukraine’s Accession to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), signed in 1994 by Ukraine, and the three NPT depositary states, the United States, United Kingdom and Russian Federation, is not a ratified, legally binding treaty, but a set of high-level political commitments. Its significance is in explicitly linking Ukraine’s sovereignty and security to the NPT, and the basic bargains enshrined in it. The NPT’s depositary states gave Ukraine security assurances in exchange for Kyiv’s renunciation of the world’s third largest nuclear weapons arsenal. Moscow’s manifest violation of this deal when it invaded Ukraine in 2014 not only eroded European security. It has also undermined the rationale of the international nonproliferation regime. While not directly related to the question of the North-Atlantic Alliance’s enlargement, Russia’s disregard for the NPT’s logic has, since 2014, escalated Ukrainian critique of NATO’s insufficient engagement in Eastern Europe, during the last quarter of a century.

In this issue, we highlight five new books by Belfer Center members.

Stephan Walt writes that Trump's foreign-policy instincts might be more sound—but he has forfeited the chance to lead.

Stephen M. Walt critiques to Francis Gavin's review of his 2018 book, The Hell of Good Intentions: America's Foreign Policy Elite and the Decline of U.S. Primacy, and offers his view on how one should not evaluate U.S. grand strategy.

Stephen Walt writes that the United States' unusual historical experience, geographic isolation, large domestic market, and general ignorance have weakened its ability to make viable foreign-policy strategies.

Stephen Walt describes what a commonsense U.S. foreign policy would look like.

Stephen Walt describes the five things that worry him the most today.

Stephen Walt writes that the era of unilateralism is over—and Washington is the last to realize it.