Pakistan and Iran

"And what of Pakistan? A former supplier of centrifuges to Iran via the covert A.Q. Khan network, and formerly its friendly neighbour, it has maintained a studious silence. For long a Saudi client state, Pakistan is now rushing to defend Saudi interests in Yemen, implausibly claiming that Saudi Arabia’s territorial integrity is threatened by Yemen’s impoverished Houthis. Which side Pakistan would have taken if the nuclear talks had failed, and if Iran had been attacked, is not in doubt. "