Saudi Arabia is interested in acquiring Russia's S-400 missile defense systems, but so far only China has signed a contract for their deliveries, the head of Russia's state technologies corporation Rostec said Monday. "There are many who want this, including Saudi Arabia, but so far no one has signed a contract except China," Sergei Chemezev said at the Dubai Airshow-2015. Russia has signed a contract with Iran on the delivery of S-300 missile defense systems and as soon as the first part of the contract is fulfilled, Tehran will rescind its court case against Russia for non-delivery, the head of Rostec said. "We're talking about the ‘three hundred' missile defense system, the contract's already been signed," Sergei Chemezev said at the Dubai Airshow-2015. He added that as soon as the first part of the contract is fulfilled, then Iran would rescind its court case against Russia for the non-delivery of the system, basically due to economic sanctions that were in place against Tehra.