He lived in France for nearly 20 years, regularly visiting Prague, where he had spent his childhood and youth.
In 1993 the prince was appointed Cambodia's delegate to UNESCO in Paris, where he became known for his hard work and his devotion to Cambodian culture.
Heavy political pressure from the United States and the USSR led to a withdrawal. The Suez Canal was closed from October 1956 until March 1957.
Israel fulfilled some of its objectives, such as attaining freedom of navigation through the Straits of Tiran, which Egypt had blocked to Israeli shipping since 1950.
He is the eldest son of King Sihanouk and Queen Norodom Monineath.
The canal eased commerce for trading nations and particularly helped European colonial powers to gain and govern their colonies.
Before ascending the throne, Sihamoni was educated in Czechoslovakia and was best known for his work as a cultural ambassador in Europe and as a classical dance instructor. His given name, Sihamoni, comprises two morphemes from his parent's given names, Sihanouk and Monineath.
At the time of his birth and that of his younger brother, his mother Monique Izzi, a Cambodian citizen of Corsican and Khmer ancestry, had been one of King Norodom Sihanouk's consorts after being a constant companion since the day they met in 1951, when she won first prize in a national beauty contest.
After the fighting had started, political pressure from the United States, the Soviet Union and the United Nations led to a withdrawal by the three invaders.
The episode humiliated the United Kingdom and France and strengthened Nasser. Britain and France issued a joint ultimatum to cease fire, which was ignored.