The U.S., Japan and South Korea have agreed to prepare a "shock therapy package" for North Korea in case it conducts another nuclear or missile test, officials here said Monday.

"Seoul, Washington, and Tokyo are going to discuss concrete ways to take punitive actions against the North in case it carries out a further provocation," a Foreign Ministry official here said. "Talk of shock therapy itself is sends a strong deterrent message."

"Beijing has already given consent to the idea," another Foreign Ministry official claimed. "The key point is to cut off the North's sources of hard currency with the help of China, while the three countries are mulling their own sanctions like the U.S. designating the North as a state sponsor of terrorism and a secondary boycott."

The chief nuclear negotiators from the three countries meet in Tokyo on Tuesday, and their foreign ministers will sit down in New York on the sidelines of the UN Security Council Ministerial Meeting on Friday.