Kim Jong-un, youngest son of ailing leader Kim Jong-il, was given powerful posts in the ruling party on Tuesday, confirming his status as ruler-in-waiting of the impoverished but nuclear-armed nation.
The North has already indicated willingness in principle to return to nuclear disarmament talks which it abandoned in April 2009, a month before staging a second atomic weapons test.
But Seoul and Washington, which accuse Pyongyang of a deadly March attack on a South Korean warship, have responded warily.
The North denies sinking the ship but has began making conciliatory gestures to the South, after freeing an American detainee in August.
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