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Transcript: Israel and Nuclear Weapons – A Talk with John Mearsheimer

In this talk hosted by the Chicago Forum for Free Inquiry and Expression at the University of Chicago, realist scholar John Mearsheimer examines Israel’s nuclear weapons program, from its origins under David Ben-Gurion and French assistance to its present-day nuclear triad. He also analyzes the Israel-Iran conflict, the collapse of the JCPOA, the limits of military strikes on Iran’s nuclear facilities, and the role of the Israel lobby in shaping US foreign policy. This lecture was delivered on 20 February 2025. Read the full transcript of the lecture below:

Opening Remarks

Introduction of Professor John Mearsheimer

CHRIS: Hello everyone. I’m Chris, 1 of the co-organizers, grad student co-organizers of tonight’s event, And I’m honored to introduce our speaker tonight, someone who really needs no introduction, Professor John J. Mearsheimer. Of the realist school, Professor Mearsheimer is 1 of the world’s leading scholars in international relations. And here at the University of Chicago, he is the R. Wendell Harrison Distinguished Service Professor in the Department of Political Science.

Among his many highly regarded scholarly contributions, I’ll just highlight 1, the most relevant 1 for tonight, namely his 2007, The Israel Lobby and U.S. Foreign Policy, which was co-authored with professor Stephen Walt. That’s it. Please join me in giving a warm welcome to professor John Mearsheimer.

JOHN MEARSHEIMER: Thank you very much for the kind introduction. It’s actually wonderful to be here. I love these sorts of engagements. I love talking, and I love going back and forth with people dealing with all of the truly important issues that face us today.

These are really exciting and thoroughly depressing times. And I think it’s very important that we talk about issues like the subject on the table today so that We can all get our heads around the subject and figure out for ourselves what we think.

What I’d like to do here is give a talk that’s in 3 parts. 1st I’d like to make some general points about nuclear weapons. 2nd I’d like to talk about the Israeli nuclear deterrent all by itself, the Israeli nuclear program. And then I’d like to talk about the Israel-Iran conflict and what that means for the possibility of nuclear proliferation, nuclear arms control, or maybe even nuclear war. So again, general points about nuclear weapons focus exclusively on Israel, number 2, and then Israel-Iran is number 3.

Nuclear Weapons: The Ultimate Deterrent

Just a couple points to start. It’s very important to understand that nuclear weapons are the ultimate deterrent. They’re not a perfect deterrent, but in terms of the weaponry that 1 can acquire, that a state can acquire to maximize its prospects of survival. Nuclear weapons are what you want.

Ehud Barak, former prime minister and defense minister in Israel, has said, “the reason I believe Iran is pursuing nuclear weapons is because it makes so much sense.” In other words, Barak understands if he were an Iranian, he’d acquire nuclear weapons. I have said publicly on numerous occasions that if I had been the Iranian national security advisor over the past 20 years, they would already have nuclear weapons.

It makes eminently good sense To me that israel has nuclear weapons and that iran wants nuclear weapons again. It’s because they are the ultimate deterrent. 2nd point you want to keep in mind is that nuclear weapons are basically weapons for peace. If you have a Middle East where every state has a survivable nuclear deterrence, the likelihood of war is much less than if you have a Middle East where nobody has any nuclear weapons.

And it’s because nuclear weapons are weapons of mass destruction. It’s hard to imagine scenarios where they would be used. And if you have 2 countries that have nuclear weapons in the Middle East or any place else on the planet, they’re unlikely to go to war with each other for fear that they’ll get incinerated. But the problem that you face is you can’t be sure that they won’t be used.

It’s very important to understand that they are the ultimate deterrent they make for a more peaceful world But you can’t be sure they won’t be used which raises the question How do you think about them and the best example to highlight this has to do with the Cold War?

We’ve run the Cold War 1 time. We ran it with nuclear weapons. Let’s say we run the Cold War again and you have a choice. You can set up the architecture under which the Cold War is run. You’re God. Right. You have 2 choices. You can run it again with nuclear weapons or you can run it again without nuclear weapons. Which 1 would you choose?

If you run it with nuclear weapons, it’s highly likely that you will not have a war between the United States and the Soviet Union. If you run it without nuclear weapons, just conventional forces, it is much more likely that you’ll have a war between the United States and Soviet Union. Which do you choose? There is no approved solution here. It’s really a matter of taste.

I’d do it with nuclear weapons again, but I would not sleep well at night because there’s always a possibility that nuclear weapons will be used. So what I’m saying here is they are the ultimate deterrent they make for a more peaceful world, but it’s much more complicated than that.

Proliferation, Enrichment and Reprocessing

3rd point you want to think about is proliferation. Proliferation has 2 dimensions. 1 is the actual proliferation process, where a state is in the process of acquiring nuclear weapons. And then there is proliferation where the other side has now acquired nuclear weapons. Proliferation has taken place in the Middle East. 5 countries now have nuclear weapons, right?

There’s a difference between getting there and being there. And getting there is a very dangerous process because there’s powerful incentives for other countries to attack your nuclear facilities before you weaponize and of course this goes to the Israel Iran case if Iran really does begin to go down The nuclear weapons road in a meaningful way, right?