For over three decades, the United States has carried the lion’s share of NATO’s defense responsibilities, while many European allies have underinvested in their military capabilities. This long-standing imbalance persisted through the Cold War and beyond, with the U.S. maintaining a significant military presence in Europe as a security backstop.

Post-Cold War Optimism and Domestic Priorities

After the Soviet Union’s collapse, European nations redirected resources from defense to domestic priorities, capitalizing on a perceived ‘peace dividend.’ This shift contributed to a 22% decrease in defense spending among European NATO members between 1992 and 1999. Meanwhile, the U.S. continued to provide substantial military support, allowing European allies to focus on expanding welfare programs, including healthcare and pensions.

American Frustration and Calls for Burden Sharing

American leaders have long expressed frustration over the defense spending imbalance. In 1953, President Dwight D. Eisenhower urged European allies to assume a larger share of NATO’s defense burden. This sentiment was echoed by subsequent administrations, including a stark warning from then-War Secretary Robert Gates in 2011 about the unsustainable future of NATO if European governments continued to underinvest in their militaries.

Renewed Urgency and Increased Spending

The annexation of Crimea by Russia in 2014 and the 2022 invasion of Ukraine heightened the urgency for increased defense spending among NATO members. President Donald Trump’s administration further pressured allies by questioning the unconditional nature of U.S. protection for those not meeting defense spending commitments. This led to a significant shift in NATO’s approach, culminating in a new agreement at the NATO summit in The Hague to increase defense spending to 5% of GDP by 2035.

Challenges Ahead

While the commitment to increased defense spending marks a positive step, experts caution that rebuilding military capabilities involves more than just financial investment. European nations remain reliant on the U.S. for critical military functions, such as logistics and intelligence. Additionally, the experience required to lead large multinational military operations cannot be quickly acquired, posing a challenge to achieving full military readiness.

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