Both Seoul and Washington have expressed willingness to talk, but the US President Donald Trump demands the North "denuke" first.
UN Syria envoy Staffan de Mistura said the delay will give both sides more time to prepare. Separately, activists blame the US-led coalition for an air strike that hit the Red Crescent in Idlib on Wednesday.
Both sides have exchanged letters to find way forward on the extradition of Fethullah Gulen, blamed by Turkey for orchestrating the July 15 putsch.
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