The alliance dilemma is a core concept in alliance politics, most fully articulated by Glenn H. Snyder in his 1984 World Politics article "The Security Dilemma in Alliance Politics" and developed further in his 1997 book Alliance Politics. Snyder argued that once states form an alliance, they face a recurring tension between two opposing risks:
- Entrapment: being dragged into a conflict over an ally's interests that the state does not fully share. A classic illustration is the chain-ganging dynamic among European powers in July 1914, where alliance commitments helped escalate a Balkan crisis into a continental war.
- Abandonment: the fear that an ally will defect, fail to honor commitments, realign, or provide only weak support when needed. Cold War European allies frequently worried whether the United States would actually risk nuclear retaliation to defend Western Europe — the credibility problem behind extended deterrence debates.
The dilemma is structural: actions that reduce one risk tend to increase the other. Tightening commitments and signaling strong loyalty reassures the partner (reducing abandonment risk) but raises entrapment exposure. Hedging, conditioning support, or pursuing parallel diplomacy with adversaries lowers entrapment risk but signals unreliability, raising the ally's incentive to defect or seek alternatives.
Snyder noted that the severity of the dilemma depends on several variables, including the degree of strategic dependence, the availability of alternative partners, the clarity of the alliance treaty's commitments, and the level of shared interests beyond the immediate threat. Bilateral alliances with no realignment options (e.g., Japan–US under the 1960 Treaty of Mutual Cooperation and Security) tend to produce stronger abandonment fears for the junior partner, while multilateral alliances with overlapping members can heighten entrapment concerns.
The concept remains widely used to analyze NATO burden-sharing disputes, US–South Korea coordination on North Korea, and debates over Taiwan policy.
Example
In 2003, several NATO members faced an alliance dilemma over the US-led invasion of Iraq: backing Washington risked entrapment in an unpopular war, while refusing risked weakening transatlantic ties and future US security guarantees.
Frequently asked questions
Glenn H. Snyder formalized it in his 1984 article 'The Security Dilemma in Alliance Politics' in World Politics and elaborated it in his 1997 book Alliance Politics.
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