The condition for the supplies of russia S-300 missile systems to Russia is that Tehran drop the lawsuit

VLADIVOSTOK, December 18. /TASS/. Iran will withdraw the lawsuit against Russia’s arms exports agency Rosoboronexport after the supplies of the first division of the S-300 missile systems take place, Russian Deputy PM Dmitry Rogozin said on Friday.
"[Now the lawsuit] has not been dropped. They should withdraw it after the supplies of the first division. When? Upon manufacturing. We can say in the near future," Rogozin told reporters.

The condition for the supplies is that Tehran drops the lawsuit, he said, adding that this issue should be decided by the Iranian parliament. "The Russian and Iranian sides have a full understanding: the contract cannot be implemented without dropping the lawsuit."
Russia and Iran signed the previous contract for the supplies of five divisions of the S-300 missile systems in 2007. In September 2010, then-President Dmitry Medvedev inked a decree on measures on implementing the UN Security Council’s resolution 1929 that in particular banned the S-300 supplies to Iran.
The contract worth over $800 million was canceled and the advance payment was sent back to the Islamic Republic. Iran filed an almost $4 billion lawsuit against Russia at the Geneva Court of Arbitration over Russia’s failure to fulfill the contract.
In April 2015, Russian President Vladimir Putin lifted the ban on delivery of S-300 missile systems to Tehran.

By TASS