There is a lot of hand wringing in Washington and other Western capitals about Russia’s sudden invasion and annexation of Crimea. But as I point out in a recent article in The National Interest Online, a policy that the United States adopted more than two decades ago made such an outcome nearly inevitable. The administrations of George H. W. Bush and Bill Clinton bribed and pressured Kiev to give up the nuclear weapons it had inherited upon the demise of the Soviet Union, thus making Russia the only nuclear‐​armed successor state.


As University of Chicago professor John Mearsheimer pointed out at the time in Foreign Affairs, that policy was extremely myopic. He argued that a Ukrainian nuclear deterrent was “imperative to maintain peace between Russia and Ukraine. That means ensuring that the Russians, who have a history of bad relations with Ukraine, do not move to reconquer it.” In a prophetic passage, he added: “Ukraine cannot defend itself against a nuclear‐​armed Russia with conventional weapons, and no state, including the United States, is going to extend to it a meaningful security guarantee. Ukrainian nuclear weapons are the only reliable deterrent to Russian aggression.”


The Crimea incident demonstrates how ill‐​advised it was for Ukraine to relinquish its inherited nuclear deterrent. Under intense U.S. pressure, Kiev discarded the one strategic asset that would have made the Kremlin exercise caution. Now, Ukrainians have no alternative but to accept a humiliating territorial amputation. Despite the abundance of rhetorical posturing, there is little that the United States and its European allies will or can do to prevent Russia from pursuing its goals regarding Ukraine—unless they are willing to risk a military confrontation with a nuclear‐​armed power in its own neighborhood. And no sane person advocates that. Even ultrahawks such as Senator John McCain concede that a U.S.-led military intervention is not an option.


True, if Ukraine had retained its nukes and Putin had nevertheless gone ahead with his military conquest of Crimea, that crisis would have been more dangerous than the current version. But it is highly improbable that the Kremlin would have adopted such a risky course against a nuclear‐​armed country. Moscow received a great geopolitical gift when Washington succumbed to its obsession to oppose nuclear proliferation in all cases, regardless of the strategic circumstances. That move effectively disarmed Ukraine and made it vulnerable to coercion by its much stronger neighbor. Both Ukraine and the United States are now paying the price for that policy blunder.