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.

DUBAI (Sputnik) � 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 Russia's state technologies corporation Rostec said Monday.

"The contract on delivery of S-300 to Iran has not only been signed by the sides but has already entered into force," Sergei Chemezov 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 Tehran.

Chemezov didn't elaborate exactly which variations of the S-300 missile defense systems will be supplied to Iran.

Moscow and Tehran signed an $800-million deal for the delivery of five S-300 missile systems in 2007. In 2011, Iran sued Russia in the Geneva Arbitration Court after Moscow suspended the contract in 2010, citing a UN Security Council resolution that placed an arms embargo on Tehran.

Russian President Vladimir Putin lifted the S-300 delivery ban in April 2015, shortly after the P5+1 group of international negotiators and Iran reached a framework nuclear agreement to remove all economic sanctions against Tehran in exchange for its pledge to ensure that all nuclear research in the country will be for peaceful purposes.

By Sputnik News