Unlikely US and Saudi allies still need one another
US and Saudis have seen their ties tested over Iraq and Iran, but trading petroleum for protection will continue to benefit both sides

Long-standing ties between the United States, the world's oldest democracy, and Saudi Arabia, an ultra-conservative Islamic absolute monarchy, have strained at times, but the unlikely allies remain bound by mutual interests.
The depth of the complex relationship was highlighted yesterday when the White House announced President Barack Obama would travel to Riyadh on Tuesday to meet the new Saudi king, Salman bin Abdul Aziz al-Saud.
The schedule change means Obama will cut short his three-day trip to India, missing a planned tour of the Taj Mahal.
The president mourned the loss of King Abdullah on Friday, saying he had "appreciated our genuine and warm friendship" and praising the late monarch as both "candid" and "bold".
Full diplomatic relations between the US and the Gulf kingdom were established in 1940 during the second world war.
It was the discovery of vast oil reserves beneath Saudi sands in the late 1930s that secured the kingdom's place as a vital partner for the energy-hungry US.