Saudi Arabia’s crown prince lands in Egypt Sunday on the first leg of his maiden foreign tour as heir to the throne, a diplomatic charm offensive that follows his stunning rise to power. Prince Mohammed bin Salman’s two-day visit to Cairo comes ahead of a scheduled trip to Britain on Wednesday for talks with Prime Minister Theresa May and the United States from March 19-22. The son of Saudi King Salman is already seen as the country’s de facto ruler controlling the major levers of government.