What are Washington and its allies to do about North Korea? In January, Pyongyang tested its fourth nuclear device. It launched a satellite in February to gather additional data for developing an intercontinental ballistic missile. Meanwhile, North Korean engineers keep cranking out weapons material that could fuel dozens of nuclear bombs in years to come.

The international response continues to be ineffective. After much pouting from concerned countries, the U.N. Security Council recently responded to the new round of tests with an impressive new collection of sanctions.

The sanctions promise to halt the movement of contraband by monitoring North Korean commerce moving in and out of the country, prohibit the export of jet and rocket fuel to Pyongyang, block the North's ability to conduct international financial transactions and ban the export of North Korean coal and minerals. But they are not enough. Even combined with the previous sanctions, this will not move the North off its nuclear pedestal. It is simply too late.