Conservative politicians on Tuesday voiced concern over the Lee Jae Myung administration’s diplomacy at a seminar in the National Assembly, urging stronger defense capabilities amid security uncertainty on the Korean Peninsula. Seoul Mayor Oh Se-hoon said South Korea could be sidelined in U.S.-North Korea talks and warned that peace with nuclear weapons is false peace. Han Dong-hoon said Seoul must take a more active diplomatic approach and criticized the government for not protesting Wang Yi’s recent two Koreas remark.

Seoul Mayor Oh Se-hoon, right, shakes hands with independent lawmaker Han Dong-hoon at a seminar held at the National Assembly in Seoul, Tuesday. Yonhap

Conservative politicians on Tuesday voiced concerns over the Lee Jae Myung administration's diplomacy amid the rapidly changing security environment on the Korean Peninsula, calling for stronger defense capabilities.

During a seminar at the National Assembly, Seoul Mayor Oh Se-hoon raised concerns that South Korea could be sidelined in potential negotiations between the United States and North Korea.

"A direct deal between the U.S. and North Korea involving a freeze of North Korea's nuclear issue and sanctions relief, with South Korea excluded, is no longer an unrealistic scenario," he said, noting that U.S. President Donald Trump has recently raised the possibility of meeting with North Korean leader Kim Jong-un.