The alliance is bolstering its military deterrent in Europe amid Russia’s invasion of Ukraine and has expanded to include Finland.

WRITTEN BY Jonathan Masters, CFR

UPDATED

Last updated April 4, 2023 7:00 am (EST)

Summary

• Established during the Cold War, NATO is a transatlantic security alliance composed of thirty-one member countries, including the United States.
• NATO has focused on deterring Russian aggression in recent years, but it has also conducted security operations in Afghanistan, Iraq, Kosovo, and Somalia. 
• Amid Russia’s invasion of Ukraine, many NATO allies are providing Kyiv with extraordinary quantities of military supplies, and the alliance has expanded to include Finland.

Introduction

Founded in 1949 as a bulwark against Soviet aggression, the North Atlantic Treaty Organization (NATO) remains the pillar of U.S.-Europe military cooperation. An expanding bloc of NATO allies has taken on a broad range of missions since the close of the Cold War, many well beyond the Euro-Atlantic region, in countries such as Afghanistan and Libya.

Russia’s unprovoked invasion of Ukraine, a nonmember, in early 2022 has shaken Europe’s security architecture and prompted a major reevaluation of NATO members’ foreign policies and defense commitments. The threat from Russia has generated the greatest tensions with the alliance in the post-Cold War era. It is driving up defense spending and has pushed some longtime NATO partners, namely Finland and Sweden, to seek full membership. Finland acceded to the alliance in April 2023.

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