I think that nuclear war is most likely if the Russians are losing. If the Russians are losing, if the Ukrainian military is rolling up Russian force… - John Mearsheimer

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I think that nuclear war is most likely if the Russians are losing. If the Russians are losing, if the Ukrainian military is rolling up Russian forces in eastern and southern Ukraine, and the sanctions are working and the Russians are on the verge of being knocked out of the ranks of the great powers, in that situation I think it's likely that the Russians would turn to nuclear weapons, and they would use those nuclear weapons in Ukraine. They would not dare use them against NATO, but they would turn to nuclear weapons. I think, given the fact that the Russians are not losing and, if anything, are winning, therefore the likelihood of nuclear war is greatly reduced. I don't want to say it's been taken off the table for one second, but I think as long as the Russians are on the upside of the battle, not on the downside, the likelihood of nuclear use is very low.