tunis british foreign secretary boris johnson meet libyan commander khalifa haftar visit benghazi thursday urge stick ceasefire announce paris last month back u.n.-led efforts end libya conflict johnson visit late show grow western recognition haftar long support egypt unite arab emirates anti-islamist stance haftar dominant figure eastern libya since early last year spurn u.n.-backed government national accord gna capital tripoli make military gain grind gna hamper infighting failure win endorsement eastern-based factions largely fail extend authority end turmoil develop nato-backed uprise topple libyan leader muammar gaddafi 2011. since 2014 libya rival governments tripoli east become main departure point migrants catch boat europe see islamic state establish lose regional stronghold coastal city sirte international efforts broke political deal result two meet haftar gna prime minister fayez seraj one abu dhabi may paris july paris meet two men shake hand ceasefire elections next year though haftar quickly play commitments johnson meet haftar visit eastern city benghazi haftar declare victory early july three-year military campaign islamists rival say encourage haftar back new u.n. envoy ghassan salame efforts find political settlement libya revise 2015 deal create gna field marshall haftar role play political process johnson say statement urge adhere commitments make recent meet paris respect ceasefire work mr. salame order amend libyan political agreement haftar fell gaddafi 1980s live two decades unite state remain divisive figure libya force replace civilian mayors many eastern cities talk liberate tripoli critics say fear return military rule wednesday johnson make second trip tripoli meet seraj also travel misrata port city major military power lead opposition haftar encourage side resolve differences dialogue conflict respect international human right law johnson say since meet paris haftar libyan national army threaten advance eastern city derna tighten blockade around city international criminal court also issue arrest warrant commander elite libyan national army unit accuse execute dozens prisoners close stag benghazi campaign libyan national army say investigate case british foreign secretary visit libyan strongman back ceasefire