This file photo taken in June 1940, in Munich, Germany, shows Adolf Hitler (R) riding in a car with Italian Fascist dictator , Benito Mussolini (L) during World War II

This file photo taken in June 1940, in Munich, Germany, shows Adolf Hitler (R) riding in a car with Italian Fascist dictator , Benito Mussolini (L) during World War II

An undated portrait of German Nazi Chancellor Adolf Hitler (1889-1945). After Hitler was made Chancellor in January 1933 he suspended the constitution, silenced opposition, exploited successfully the burning of the Reichstag (Parliament) building, and brought the Nazi Party to power. All images/ AFP

Picture dated 1959 of Cuban leader Fidel Castro shortly after toppling dictator Fulgencio Batista during the revolutionary triumph, in Cienfuegos, 04 January 1959

Portrait of General Idi Amin Dada, the Commander in Chief of the Ugandan Armed Forces taken in the sixties

A photo taken on July 28, 1945 shows US President Harry Truman (L) and Soviet leader Joseph Stalin during the Potsdam conference

A photo taken on July 28, 1945 shows US President Harry Truman (L) and Soviet leader Joseph Stalin during the Potsdam conference

Picture released on December 1969 of Chairman of the Revolutionary Council of Algeria Houari Boumediene (L) and Lybian leader Muammar al-Gaddafi (R) attending the first summit of the Arab League in Rabat, where was created the OIC (Organisation of Islamic Cooperation)

Picture released on December 1969 of Chairman of the Revolutionary Council of Algeria Houari Boumediene (L) and Lybian leader Muammar al-Gaddafi (R) attending the first summit of the Arab League in Rabat, where was created the OIC (Organisation of Islamic Cooperation)

This file picture taken in October 1935 released by the Chinese official news agency shows Chairman of the Chinese Communist Party Mao Zedong in the Northern Shensi Province after 'the Long March' (October 1934 to October 1935), he performed leading the Red Army's Fourth Front Army

Portrait taken in July 1989 of Sudanese Revolutionary Council leader General Omar Al-Beshir (Umar Hassan Ahmad al-Bashir) who took power after toppling the civilian government of Prime minister Sadiq Al-Mahdi in a coup on June 30, 1989

Portrait taken in July 1989 of Sudanese Revolutionary Council leader General Omar Al-Beshir (Umar Hassan Ahmad al-Bashir) who took power after toppling the civilian government of Prime minister Sadiq Al-Mahdi in a coup on June 30, 1989

Retouched official picture dated probably 1956 in Moscow of Soviet leader Nikita Khrushchev

Retouched official picture dated probably 1956 in Moscow of Soviet leader Nikita Khrushchev

Iraqi President Saddam Hussein shown in file picture dated 28 May 1990 in Baghdad, addresses the opening session of the Extraordinary Arab Summit called to adopt a unified Arab stance against Soviet Jewish immigration to Israel

Iraqi President Saddam Hussein shown in file picture dated 28 May 1990 in Baghdad, addresses the opening session of the Extraordinary Arab Summit called to adopt a unified Arab stance against Soviet Jewish immigration to Israel

This picture taken in October 1980 and released by North Korea's official Korean Central News Agency (KCNA) on October 30, 2015, shows former North Korean leader Kim Il-Sung speaking during the sixth Congress of the Workers' Party of Korea (WPK) at the April 25 House of Culture, originally named 'February 8 House of Culture' in Pyongyang, between 10 and 14 October 1980. North Korea announced on October 30, 2015 it would convene a congress of its ruling Workers' Party for the first time in 35 years, reviving a forum last gathered under the rule of current leader Kim Jong-Un's grandfather, Kim Il-Sung

North Korean Leader Kim Jong Il attends a meeting with the European Union delegation in Pyongyang, 03 May 2001. The reclusive North Korean leader is scheduled to meet twice today with members of the European Union delegation

This undated photo released by North Korea's official Korean Central News Agency (KCNA) on November 21, 2017 shows North Korean leader Kim Jong-Un at the Sungri Motor Complex in South Pyongan Province

This undated photo released by North Korea's official Korean Central News Agency (KCNA) on November 21, 2017 shows North Korean leader Kim Jong-Un at the Sungri Motor Complex in South Pyongan Province

Haile Mariam Mengistu, Ethiopian leader and the chairman of the Provisional Military Administration Council (1977-87) and future Ethiopian President (1987-91) listens to the national anthem during welcoming ceremony prior the opening of the Non-aligned summit 31 October 1986 in Harare. Mengistu, born in 1937, took part in 1960 in the attempted coup against Haile Selassie and in 1977, after a further coup, became undisputed Ethiopian ruler. He set out to create a socialist state in Ethiopia aligned with the communist block, but was overthrown in 1991 by the Ethiopian People's Democratic Front