Ethiopia agreed to lease 20km (12 miles) of coastline from Somaliland in exchange for recognition of its independence.
Rift comes after Somaliland deal giving landlocked Ethiopia access to the Red Sea.
A recent Ethiopian agreement with breakaway Somaliland threatens to destabilise the whole region.
President Mohamud objects to Ethiopias Red Sea port deal with Somaliland, territory Somalia claims as its own.
Ethiopias economy has struggled with no sea access, and an agreement to use a Somaliland port has upset its neighbour.
The agreement accentuates historical ties between Ethiopia and Somaliland - and historical hostility with Somalia.
Egypt is concerned that Ethiopia is using water from the Nile to fill its giant Renaissance dam.
The Egyptian foreign ministry condemns the move, calling Ethiopias filling of the dam illegal.
Ethiopia says army stopped attackers before they could wreck havoc in the border town of Dollo.
La compagnie Ethiopian Airlines a rapatrié les passagers tchadiens dans l'après-midi du 29 octobre avec un autre appareil E-TAKK de type 737-800, à la suite d'un incident de vol survenu à Addis Abe...