ABU DHABI – The leading Republican candidates were weirdly overt with their promises in last weekend’s debate about waging covert war against Iran, and even assassinating its scientists. Perhaps it’s a sign that foreigners don’t take American politics very seriously, but the inflammatory talk created barely a ripple in this part of the world.

Or maybe the savvy, cynical Middle East believes that the covert war has already begun — with Israel’s Mossad conducting lethal operations of the sort Republicans are clamoring for the CIA to adopt. The danger is that if the other side thinks the conflict has already started, it will feel compelled to retaliate.

The language the GOP candidates used was astonishing, at least for people who assume that covert activities are ones that aren’t talked about openly — much less touted in campaign debates.

With the easy talk about waterboarding and “taking out” Iranian scientists, it seemed, too, that the party was back to 2006 — recaptured by the hard-line policies of Dick Cheney, and the neoconservative ideology that undergirded them. The hawkish GOP line echoed that of Israeli Prime Minister Benjamin Netanyahu, who according to Israeli press leaks has in recent weeks been arguing the case for war.

This field of Republicans says strange things in debates, but it was still startling to hear the leading candidates’ statements. Mitt Romney pledged to “work on a covert basis to encourage the dissidents.” Herman Cain said he would “assist the opposition movement in Iran that’s trying to overthrow the regime.” Newt Gingrich promised “maximum covert operations … including taking out their scientists, including breaking up their systems. All of it covertly, all of it deniable.”

Romney also promised “covert activity” against Syria, while Gingrich argued for a “mostly covert” effort to topple the Syrian regime.

What is it about “covert” that the Republicans don’t understand? What would be the American reaction to similar public threats against the United States if they were made by Iranian or Syrian politicians? This kind of loose talk is one reason the world doesn’t take the CIA as seriously as it once did. Activities that are so glibly discussed lose some of their credibility, in addition to their deniability.

Here in the Persian Gulf, many leaders would secretly love to see the United States (and probably Israel, too) take a pop at Iran, as long as they don’t have to face the blowback. That’s the risk of secret war; the enemy can respond covertly, where and when it chooses. That’s why the gulf states are so nervous about the Shiite opposition movement in Bahrain, and the Shiite-led government of Nouri al-Maliki in Iraq. They see them (not always correctly) as weapons in Iran’s secret arsenal.

Beyond the war talk of recent weeks, it’s clear that the confrontation over Iran’s nuclear program truly is “the Cuban missile crisis in slow motion,” to use Harvard professor Graham Allison’s memorable phrase. Either the Iranians agree to turn back their program, or the West accedes to Iran becoming a nuclear weapons state. The alternative is a collision.

The question is starkly similar to what President John F. Kennedy faced in the October 1962 Cuban missile standoff: He sought a way to convey U.S. determination without outright war. The Pentagon generals were screaming that Kennedy had to bomb the Soviet missile sites in Cuba — in much the same way that Israeli hawks are agitating today for a bombing campaign against Iran. Kennedy wisely realized that it wasn’t all or nothing; he could operate along a continuum of power, in which bombing would be the last step, not the first.

The option Kennedy chose deserves some discussion now. He decided, against the advice of most advisers, on a “quarantine” of Cuba to prevent the nuclear missiles from becoming operational. It was a step well short of war (or even lethal covert action), and it left the Soviets room to maneuver. It also avoided the political fallout across Latin American that would have come from bombing Cuba (similar to the destabilizing effect that bombing Iran would cause for America and Israel).

A quarantine of Iran’s nuclear program could take many forms, along a ladder of escalating seriousness. It would seek to enforce United Nations resolutions, peacefully. If crafted wisely, it would have the support of most U.S. allies.

As America chooses its tools along the continuum of power, it will undoubtedly continue (and perhaps augment) its covert activities against Iran. But they lose their impact and rationale if they become a topic for facile domestic political debate.

David Ignatius is a columnist for The Washington Post. He can be contacted at davidignatius(at)washpost.com