(EXPRESS) — Dictator Kim Jong-un was pictured watching the offshore test launch at the weekend, which came just days after the volatile and secretive nation threatened to attack sworn enemy America with nuclear weapons.

South Korean officials claimed the communist country could perfect the devastating ballistic missile technology – with capability of reaching US mainland from an undetectable distance – within two to three years.

Kim Min-seok, South Korea’s defence ministry spokesman, said: “We urge North Korea to immediately stop developing submarine-launched ballistic missiles which hinder the stability of the Korean peninsula and Northeast Asia.”

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