Anthony Zinni was appointed to his post two months after Gulf crisis erupted [File: Kathy Willens/ AP]

A US envoy tasked with resolving the diplomatic crisis between Qatar and its Gulf Arab neighbours has quit his post citing “unwillingness” of regional leaders to engage in dialogue, according to CBS News.

The US-based broadcaster said on Tuesday that Anthony Zinni, a retired Marine general, resigned after realising he “could not help resolve” the 18-month-long

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