islamabad afghanistan china pakistan unite state meet oman monday try find ways revive peace talk afghan taliban militants two officials pakistan foreign ministry say clear afghan taliban join talk far fail restart tentative process collapse 2015. taliban source previously say would stay away discussions muscat cast doubt prospect revive long-stalled negotiations pakistani officials speak condition anonymity authorize disclose information say talk resume pakistan initiative pakistani team lead foreign secretary tehmina janjua immediate comment unite state china afghanistan talk resume four-nation quadrilateral coordination group qgc comprise afghanistan china pakistan unite state last meet islamabad early last year try ease path direct talk afghan government taliban little success amin waqad close aide agfhan president ashraf ghani senior member high peace council hpc say last week country would participate muscat meet taliban representatives would also taliban deny receive invitation efforts kick-start negotiations fail due taliban refusal attend talk last leader mullah akhtar mansur kill u.s. drone strike pakistan last year unite state want pakistan accuse harbour afghan taliban commanders exert influence group bring negotiate table pakistani officials deny shelter taliban militants say influence group wan four nations meet resume stall afghan peace talk oman