Top diplomats and defense officials from South Korea and the United States on Wednesday warned of ' serious consequences' in case of the Democratic People's Republic of Korea (DPRK)'s further provocation and announced a plan to introduce fresh sanctions against the DPRK's proliferation activities. Following the so-called 'two plus two' security talks, designed to reaffirm their robust military alliance in the face of heightened tension on the Korean peninsula, U.S. Secretary of State Hillary Clinton spoke to reporters in a joint press conference that the United States will introduce new 'country- specific' sanctions against the DPRK's procurement of nuclear materials. Clinton said UN Security Council Resolutions 1718 and 1874 will be more strictly imposed on Pyongyang, and entities and individuals engaged in illicit activities will be subject to asset freeze under the state and treasury designation. While calling on the DPRK to abandon all its nuclear programs and its pursuit of nuclear weapons, the top U.S. diplomat said stalled six-party nuclear talks, aimed at ridding Pyongyang of its nuclear programs, 'is not something we are looking at yet.' The talks, the first of its kind held between Seoul and Washington, were also joined by U.S. Defense Secretary Robert Gates, South Korean Foreign Minister Yu Myung-hwan and Defense Minister Kim Tae-young. Gates, who arrived on Monday for advance talks, finalized details of joint military drills with the Defense Minister Kim Tae- young during a meeting a day ago. The first joint exercise involving the U.S. aircraft carrier USS George Washington will come on July 25 in waters off the east coast of the Korean peninsula, and is meant to deliver a 'clear message' to the DPRK that provocation must be stopped, the ministers have said. 