The secretary-general was addressing his year-end press conference at the UN Headquarters in New York, summing up the UN work in the outgoing year and touching on major challenges for the world body in the coming year.
Earlier he briefed the UN Security Council on the final report of a UN fact-finding panel, on the allegations of the use of chemical weapons in the Syrian conflict.
But at the meeting, Russia and western nations clashed over who is to blame for chemical weapons attacks inside Syria.
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Producer : Xinhua News Agency