Siege of Saïo the Italian dictator, Benito Mussolini, proclaimed the colony of "Africa Orientale Italiana" (AOI, Italian East Africa), formed from Ethiopia (after the Italian victory in the Second Italo-Ethiopian War, fought 3 October 1935 – May 1936) and the existing Italian possessions of Italian Eritrea and Italian Somaliland. On 10 June 1940, Mussolini declared war on Britain and France, which made Italian military forces in Libya a threat to Egypt and those in Italian East Africa a danger to the British and French colonies in East Africa. Italian belligerence also closed the Mediterranean to Allied merchant ships and endangered British supply routes
Foreign relations of Vichy France their own colony, Empire of Vietnam, as a double puppet state. During the Italian invasion and occupation of Ethiopia in the mid-1930s and during the early stages of World War II, constant border skirmishes occurred between the forces in French Somaliland and the forces in Italian East Africa. After the fall of France in 1940, French Somaliland declared loyalty to the Vichy France. The colony remained such during the East African Campaign but stayed out of that conflict. This lasted until December 1942. By that time, the Italians had been defeated and the French colony was isolated by a British