ETHIOPIA'S deal to lease a port in Somalia's breakaway region of Somaliland has infuriated the government in Mogadishu and prompted concern it will further destabilise the Horn of Africa region. Under a memorandum of understanding signed on January 1, landlocked Ethiopia would lease 20 km (12 miles) around Somaliland's port of Berbera for 50 years, in exchange for stakes in Ethiopian state-run companies and possible recognition as an independent nation. Somalia has responded by calling the deal an act of aggression and says it will block it. Ethiopia says it is merely striking a commercial arrangement to address a need for access to…