South Korea is considering joining a US-led initiative to curb weapons of mass destruction after North Korea's rocket launch on Sunday, Foreign Minister Yu Myung-Hwan said.

North Korea has warned that the South's participation in the Proliferation Security Initiative (PSI) would amount to a declaration of war.

"North Korea's long-range rocket launch highlighted the need for the PSI," Yu told reporters. "The government is actively considering participating fully in PSI."

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