Saudi new King Salman (C), Crown Prince Moqren bin Abdul Aziz (3L) and deputy Crown Prince and Interior Minister Mohammed bin Nayef (L) walk to greet US President Barack Obama (unseen) and First Lady Michelle Obama (unseen) at King Khalid International Airport in Riyadh on January 27, 2015. Obama landed in Saudi Arabia to shore up ties with new King Salman and offer condolences after the death of his predecessor Abdullah. AFP PHOTO / SAUL LOEB / AFP / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)