Azerbaijan has announced a “unilateral ceasefire” in fighting with Armenian forces over the disputed Nagorno-Karabakh region.A defence ministry spokesman said the Azeris were acting in response to international calls to halt violence.But the Armenia-backed Karabakh military said “fierce fighting” was continuing.Nagorno-Karabakh has been in the occupation of  separatists since a war that ended in 1994.Fighting had continued into Sunday, after clashes left 30 soldiers dead and caused civilian casualties.