From Time Magazine:
After more than 15 years of largely fruitless diplomacy, the U.S. and its allies are preparing a high-seas quarantine to try to ensure that North Korea's nuclear knowledge doesn't leach beyond its borders. While the details remain to be worked out, President Obama — after meeting with South Korea president Lee Myung-bak in Washington on Tuesday — indicated the battle to contain North Korea's atomic aresenal is headed offshore. "This is not simply a U.S. policy — this is an international policy," Obama said of the evolving plan to search North Korean vessels suspected of ferrying arms or nuclear components. "This was part of what the [U.N.] Security Council resolution calls for — the interdiction of arm shipments."
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My Comment: I doubt that it will slow down North Korea's nuclear program, but to save face the North Koreans will react militarily .... are we ready for that?