SEOUL - Defense chiefs of South Korea and the United States agreed on Monday to a joint operation plan against nuclear and missile threats from the Democratic People's Republic of Korea (DPRK).

U.S. Defense Secretary Ashton Carter, who arrived in Seoul Sunday for a two-day visit, held the 47th round of the Security Consultative Meeting (SCM), the annual defense ministers' meeting between Seoul and Washington, with his South Korean counterpart Han Min-Koo at Seoul's defense ministry headquarters.

The talks resulted in a 16-point joint statement, which approved the so-called "4D operation plan" to detect, track and destroy the DPRK's ballistic missiles mounted with nuclear or biochemical warheads.

The 4D plan for joint military operations and exercises, which stands for Detect, Disrupt, Destroy and Defense, will reportedly be reflected in the "Operation Plan 5015" of the U.S.-South Korea combined forces that will replace the former "Operation Plan 5027" to defend South Korea from possible DPRK missile threats.

The joint anti-missile strategy means a concept of closely watching moves in the DPRK's nuclear and missile bases with U.S. surveillance assets, like military satellites and high-altitude unmanned aerial vehicles, to strike the targets in the DPRK in case of emergency with precision-striking weapons of both Seoul and Washington.

The two defense ministers also sent a warning to the DPRK, saying that the two allies will not allow any type of invasions or military provocations from the DPRK, according to the joint statement.(Xinhua)