Libya's unity government has announced it is halting 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).

'We are announcing the suspension of our participation in the military talks taking place in Geneva until firm positions are adopted against the aggressor (Haftar) and his violations' of the truce, the GNA said late Tuesday.

'Without a lasting ceasefire- negotiations make no sense.

There can be no peace under the bombing,' it added.