WSJ: Rarely has a Presidential speech been so immediately and transparently divorced from reality as Mr. Obama's in Prague

The truth is that Mr. Obama's nuclear vision has reality exactly backward. To the extent that the U.S. has maintained a large and credible nuclear arsenal, it has prevented war, defeated the Soviet Union, shored up our alliances and created an umbrella that persuaded other nations that they don't need a bomb to defend themselves.

The most dangerous proliferation in the last 50 years has come outside the U.S. umbrella on the South Asian subcontinent, where India and Pakistan want to deter each other. No treaty stopped A.Q. Khan. Meanwhile, the world's most conspicuous antiproliferation victories in recent decades were the Israeli strike against Saddam Hussein's nuclear plant at Osirak, and the U.S. toppling of Saddam and the way it impressed Libya's Moammar Ghadafi.

All of which means that any serious effort at nonproliferation has to begin with North Korea and Iran. They are the urgent threat to nuclear peace, the focus of years of great-power diplomacy and sanctions. U.N. resolutions have formally barred both countries from developing an atomic bomb and the missiles to deliver them. If Iran acquires a bomb or North Korea retains one despite this attempt to stop them, then the world will conclude that there is no such thing as an enforceable antinuclear order. It will be every nation for itself.

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