Saudis Feeling Pain of Supporting U.S.
Bush administration officials say they are confident that Saudi Arabia will agree to provide critical bases for offensive operations against Afghanistan, even though announcement of Saudi cooperation strains relations between Washington and Saudi's conservative rulers; Saudi leaders voice public support in struggle against terrorism, but they are sensitive to launching military operations against another Muslim state from their territory; members of Saudi royal family are concerned about threats from Osama bin Laden, who has called on Muslims to overthrow monarchy for allowing in 'infidel' forces; bin Laden is outcast from one of Saudi Arabia's most prominent families; Saudis have reportedly offered millions of dollars to Taliban rulers to expel or turn over bin Laden; Secretary of State Colin L Powell and Saudi Arabia's ambassador to Washington, Prince Bandar bin Sultan, are in contact by telephone, yet significant level of uncertainty remains over level of participation in American-led military campaign by Saudi Arabia, which fears damage from their own extremists (M)