ADDIS ABABA (Reuters) -Rebellious Tigrayan forces in Ethiopia have said they will respect a ceasefire proposed by Prime Minister Abiy Ahmed’s government as long as sufficient aid is delivered to their war-scarred northern region “within reasonable time”. The government in Addis Ababa declared the cessation of hostilities on Thursday, saying it was to allow aid to flow into Tigray. However, it was not immediately clear how it would enforce this on the battlefield, where a mix of regional fighters and volunteer militias have been fighting the Tigrayan forces. “The government of Tigray will do ev…