"China urges parties concerned to exercise restraint, avoid provoking each other, (and) do more to ease tension," foreign ministry spokesman Hong Lei told reporters at a regular briefing in Beijing.
Pyongyang has been flexing its military muscle of late, but its claims Wednesday that it could miniaturise nuclear warheads were dismissed by the United States.
Beijing is Pyongyang's main ally, but its patience has been tried by the North's antics in recent years, and Kim Jong-Un, the leader of the alienated state, has yet to visit China three years after coming to power.
Pyongyang walked out of the process in 2009, three years after carrying out its first nuclear test, and has subsequently detonated two more devices underground.
Hong Thursday repeated calls to resume the talks, adding: "China consistently stands for denuclearisation of the Korean peninsula, peace and stability of the peninsula, and settlement of relevant issues through dialogue and consultation."