Yoon said the North Korean projectile launched earlier Tuesday currently appeared to have an intermediate range, confirming an earlier report from the US military.

Still, the press secretary noted the latest launch may have been part of the communist state's move toward developing an intercontinental ballistic missile.

Seoul's Joint Chiefs of Staff earlier said the projectile flew some 930 kilometers.

Moon too noted it appeared to be an intermediate range missile but said his country would handle it as if it were an ICBM.

"We plan to devise necessary measures assuming it may have been an ICBM," he told the NSC meeting, according to Cheong Wa Dae pool reports.

"I strongly urge North Korea to come out of its delusion that nuclear and missile development ensures its safety and make a decision to denuclearize," he said.

The latest North Korean missile launch came shortly after the South Korean president returned home from a visit to Washington, where he and his US counterpart, Donald Trump, agreed to seek a phased denuclearization of the North, enabling a resumption of dialogue with the reclusive state following its initial steps to denuclearize.

"I express a deep disappointment and regret over the fact that North Korea staged such a provocation only a few days after President Trump and I urged North Korea to reduce its provocations, refrain from military action that causes instability, and make a strategic decision to abide by international duties and regulations," Moon said.

"North Korea's nuclear weapons and missiles are a matter of our life or death that threatens the very safety and lives of our people and our allies. We will not tolerate any such threat under any circumstances." (Yonhap)