As a result, NATO was for a long time at odds over what is seemingly the core of the nuclear question: how to deter whom with what? Does NATO still need American nukes deployed on European territory, as during the Cold War, or can’t they be put offshore on American submarines? Can’t we agree with Moscow on a withdrawal of all nuclear weapons in Europe, as Russia still keeps thousands of them on its European territory? Wouldn’t such an arrangement get us closer to the nuclear free world President Obama had enthusiastically announced at the beginning of his presidency?

Confronted with the danger of a nuclear Iran, with an unpredictable North Korea, and with an increasingly confrontational government in Moscow, NATO finally found nuclear realism. In Chicago, the Alliance agreed that U.S. nuclear weapons in Europe remain necessary for NATO’s deterrence requirements—hence, they remain deployed in Germany, Italy, and elsewhere. Moreover, “all elements” of nuclear deterrence have to be kept efficient—this means that weapons need to be modernized when they become technically obsolete. Arms control with Russia should be tried, but the chances of success remain slim. Global nuclear disarmament remains a nice idea but it has been put on the backburner.

One can agree or disagree with these points, but the fact that this agreement was signed at the highest political level in NATO—including by the German chancellor—creates a reality. NATO now has a nuclear consensus which cannot be put into question any more—not even by the foreign minister of a major member state or by the “Russia first” faction in NATO.

As important as the agreement itself was the fact that NATO dared to tackle these controversial questions at all, instead of sweeping them under the carpet. The Deterrence Review process was as important as the result.

This is why discussions need to go on dealing with the follow-on problems. Will NATO’s deterrence equation change if Teheran possesses a nuclear bomb? What if other countries in the Middle East or in East Asia strive for nuclear weapons as well? What is the relationship between nuclear deterrence and missile defense? Who will pay for costly deterrence capabilities when the financial crisis hits us even harder? These are some of the issues that make a further NATO nuclear dialogue necessary. It is time to forget about the nuclear free world and tackle the real issues.

Karl-Heinz Kamp is research director of the NATO Defense College in Rome. The views expressed here are the author’s own.