Instead of paving Russia’s path to greatness, invading Ukraine would ensure Mr. Putin’s infamy by leaving his country diplomatically isolated, economically crippled and strategically vulnerable in the face of a stronger, more united Western alliance.

Hugh, I know I shouldn't even be asking you this, but what we really need in order to go in and take out Saddam is a precipitous event—something that would make us look good in the eyes of the world. Could you have one of our U-2s fly low enough—and slow enough—so as to guarantee that Saddam could shoot it down?

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I have been reminded in recent months of that nearly three-hour session with Mr. Putin as he has massed troops on the border with neighboring Ukraine. After calling Ukrainian statehood a fiction in a bizarre televised address, he issued a decree recognizing the independence of two separatist-held regions in Ukraine and sending troops there. Mr. Putin’s revisionist and absurd assertion that Ukraine was “entirely created by Russia” and effectively robbed from the Russian empire is fully in keeping with his warped worldview. Most disturbing to me: It was his attempt to establish the pretext for a full-scale invasion. Should he invade, it will be a historic error.

Although Mr. Putin will, in my experience, never admit to making a mistake, he has shown that he can be both patient and pragmatic. He also is surely conscious that the current confrontation has left him even more dependent on China; he knows that Russia cannot prosper without some ties to the West.

There is a significant moral difference between a person who commits a violent crime and a person who tries to cross a border illegally in order to put food on the family table. Such migrants may violate our laws against illicit entry, but if that's all they do then they are trespassers, not criminals. They deserve to have their dignity respected.