<Ul> <Li> Saudi Arabia severed diplomatic contacts with Germany on 11 September 1939, and with Japan in October 1941 . Although officially neutral, the Saudis provided the Allies with large supplies of oil . Diplomatic relations with the United States were established in 1943 . King Abdul Aziz Al - Saud was a personal friend of Franklin D. Roosevelt . The Americans were then allowed to build an air force base near Dhahran . Saudi Arabia declared war on Germany on 28 February 1945 and Japan on 1 April 1945, but no military actions resulted from the declaration . </Li> </Ul> <Li> Saudi Arabia severed diplomatic contacts with Germany on 11 September 1939, and with Japan in October 1941 . Although officially neutral, the Saudis provided the Allies with large supplies of oil . Diplomatic relations with the United States were established in 1943 . King Abdul Aziz Al - Saud was a personal friend of Franklin D. Roosevelt . The Americans were then allowed to build an air force base near Dhahran . Saudi Arabia declared war on Germany on 28 February 1945 and Japan on 1 April 1945, but no military actions resulted from the declaration . </Li> <Ul> <Li> Tibet (unrecognised; claimed by China but de facto independent), remained neutral throughout World War II </Li> </Ul> <Li> Tibet (unrecognised; claimed by China but de facto independent), remained neutral throughout World War II </Li>

Which countries in europe and north africa remained free of axis control