We should not, by presidential fiat, be conducting military strikes and going to war with North Korea.

It is not an enduring challenge. You just put a 50-percent tariff on all their exports to the United States, and you will get their attention.

You just put a 50-percent tariff on all their exports to the United States, and you will get their attention.

We have to make sure that we don't stumble into war. And I am concerned about the rhetoric that sounds like adolescent boys at a junior high school.

We need a strong military to deter North Korean action, but we also need diplomacy.

Nothing is illegal if 50 major businesses all decide it is the right policy.

If China were to end all banking and all trade, except food and medicine, that is to say, exporting food and medicine to North Korea, how big of an effect would that have on the regime?

We turned them down. Vice President Cheney imagined that we could have a righteous invasion of North Korea. Bad idea now. Bad idea then.

You can do it, but how do you summon the political will to do it?

Sanctions can work only if they are multinational. There is plenty of business to be done in Europe and Asia.

Sanctions have worked. In fact, they have worked better over the last 50 years than major military interventions.

Sanctions are derided because they are hostile. But those who prize peace should be informed that they are not a prelude to war but a substitute for it.