Libya's unity government announced late Tuesday it would halt its participation in UN talks aimed at brokering a lasting ceasefire in the war-torn country where a fragile truce has been repeatedly violated. The pull-out came after a barrage of rocket fire hit a port in the capital Tripoli -- the target of a months-long operation by eastern military commander Khalifa Haftar to oust the Government of National Accord (GNA). The port strikes were the latest violation of a tenuous truce that came into effect in January, brokered by Haftar-backer Russia and Turkey, which supports the UN-recognised government in Tripoli.