N. Korea: No longer bound by 1953 truce

Yep, "The One" is making the world safer by the minute.

SEOUL, South Korea (CNN) -- North Korea threatened military action Wednesday after South Korea joined a U.S.-led effort to limit the trafficking of weapons of mass destruction, the official Korean Central News Agency said.

South Korea said Monday that it was joining the 6-year-old Proliferation Security Initiative (PSI) because of "the grave threat WMD and missile proliferation is posing to global peace," said Foreign Ministry spokesman Moon Tae-young.

The effort is aimed at halting shipments of weapons technology, a rare source of hard currency for North Korea, but Moon said the south would continue to uphold a shipping agreement with the North.

"Our revolutionary armed forces ... will regard" South Korea's participation "in the PSI as a declaration of war ..." the North's official news agency said.