North Korea may carry out addition missile tests before the end of the year in spite of recent United Nations Security Council sanctions, warned South Korea’s spy agency on Monday. It said that Pyongyang is seeking to polish up its long-range missile technology and ramp up the threat against the United States. The North has made no secret of its plans to develop a missile capable of hitting the US mainland. It has already fired two missiles over Japan. “The agency is closely following the developments because there is a possibility that North Korea could fire an array of ballistic missiles this year under the name of a satellite launch and peaceful development of space, but in fact to ratchet up its threats against the United States,” lawmakers told reporters after a closed-door briefing by Seoul’s National Intelligence Service. The reclusive state appears to have carried out a recent missile engine test while brisk movements of vehicles were spotted near known missile facilities, said Yi Wan-young, a member of South Korea’s parliamentary intelligence committee which was briefed by the spy agency. No sign of an imminent nuclear test had been detected, Yi noted. The third tunnel at the Punggye-ri complex remained ready for another detonation “at any time”, while construction had recently resumed at a fourth tunnel, making it out of use for the time being. North Korea defends its weapons programs as a necessary defense against US plans to invade. The United States, which has 28,500 troops in South Korea, a legacy of the 1950-53 Korean war, denies any such intention. Pyongyang is also carrying out a sweeping ideological scrutiny of the political unit of the military for the first time in 20 years, according to Kim Byung-kee, another lawmaker in the committee. The probe was led by the ruling Workers’ Party’s Organization and Guidance Department and orchestrated by Choe Ryong Hae, who once headed the General Political Bureau of the Korean People’s Army himself until he was replaced by Hwang Pyong So in May 2014. As a result, Hwang and Kim Won Hong, who Seoul’s unification ministry said was removed from office in mid-January as minister of the Stasi-like secret police called “bowibu”, had been punished, the lawmaker said. He did not elaborate. It was unclear whether they were verbally warned, dismissed or banished to a rural area. Choe, who was subjected to political “reeducation” himself in the past, appears to be gaining more influence since he was promoted in October to the party’s powerful Central Military Commission. The National Intelligence Service indicated that Choe now heads the Organization and Guidance Department, a secretive body that oversees appointments within North Korea’s leadership. “Under Choe’s command, the Organization and Guidance Department is undertaking an inspection of the military politburo for the first time in 20 years, taking issue with their impure attitude toward the party leadership,” the lawmaker, Kim, said. Separately on Monday, South Korea approved a request by a South Korean to attend an event in the North marking the anniversary of the death of his mother who formerly led the Chondoist Chongu Party, a minor North Korean political party. The son, identified only by his surname Choi, will be the first South Korean to visit the North since liberal President Moon Jae-in took office in May. He is scheduled to arrive in Pyongyang via China on Wednesday and return on Saturday, according to Seoul’s unification ministry. Meanwhile, a senior Chinese official wrapped up a four-day visit to North Korea on Monday, apparently without meeting the country’s leader, Kim Jong Un. Song Tao, the highest-ranking official to go to Pyongyang in two years, was officially tasked with briefing the North Korean government on Chinas recent party congress. Neither side had commented on the tone of the visit as Song wrapped up his official itinerary Monday. But his trip was being watched closely because it came on the heels of US President Donald Trumps Asian tour and heightened efforts to push the North to abandon its development of nuclear weapons. Song, head of the Chinese Communist Partys International Department, met with North Korean ruling party Vice Chairman Choe Ryong Hae and former Foreign Minister Ri Su Yong. The officials “exchanged views on the Korean peninsula issue”, China’s official Xinhua news agency said. “The ruling parties of China and the Democratic People’s Republic of Korea on Monday pledged to strengthen inter-party exchanges and coordination, and push forward relations,” it added, using North Korea’s official name. On Saturday and at the time of Song’s visit, China said that traditional friendship between Beijing and Pyongyang represents “valuable wealth” for their people. There was no mention of the crisis over North Korea’s weapons. “Both sides must work hard together to promote the further development of relations between the two parties and two countries to benefit their two peoples.” China has repeatedly pushed for a diplomatic solution to the crisis over North Korea’s development of nuclear weapons and missiles to carry them, but in recent months it has had only limited high-level exchanges with North Korea.