sentences:  UN officials and weapon specialists have suggested this review was prompted by a distancing of relations with the US, concerns over Iran's nuclear program, and the lack of international pressure on Israel to give up its nuclear weapons.In 2008 of May, the United States and Saudi Arabia signed a memorandum of understanding, as part of the United States' vintage Atoms for Peace program, to boost Saudi efforts for a civilian nuclear program.This program did not involve support for development of nuclear weapons.