The South Korean government said it would use every diplomatic and military measure to deal with North Korea's repeated provocations including its fifth nuclear test and violation of UN Security Council resolutions. 
South Korean President Park Geun-hye's chief foreign policy secretary Kim Kyou-hyun "North Korean leadership should realize that its fanatic obsession with nuclear and missiles, while ignoring the dire livelihood of its people, will only make it internationally isolated and economically deprived, which surely leads to self-destruction," Kim said. 
He introduced the comment by New Zealand's Prime Minister John Key made at the East Asia Summit held in Laos that North Korea is a "ticking bomb" that nobody knows when it will blow off and that every possible measure should be put on the discussion table to remove its nuclear program.

Source : QNA