By a staff reporter : The US on Sunday urged North Korea to stop "counterproductive" missile tests, but expressed hope Pyongyang would respond positively to Washington's call for dialogue. It comes after North Korea fired a submarine-launched ballistic missile (SLBM) on Tuesday, prompting an emergency meeting of the UN Security Council.US special representative on North Korea Sung Kim met his southern counterpart Noh Kyu-duk after a meeting with their Japanese counterpart in Washington.