South Korean President Moon Jae-in said on Tuesday it would not be easy for reclusive North Korea to destroy its nuclear arsenal quickly, even if wanted to, given its weapons programs were so developed.

North Korea is under heavy international pressure to end its weapons programs, pursued in defiance of U.N. Security Council resolutions. But it has vowed never to give up its nuclear arsenal.

Speaking to reporters in the Philippines, Moon said that if North Korea agreed to hold talks, negotiations could be held with all options open.