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.
The contract was terminated, the prepayment was returned to Iran, but as the contract was not observed Iran filed a suit to the Geneva arbitration
court claiming almost $4 billion.
Meanwhile, Bulgaria s national electricity company has launched a counter-suit against Atomstroiexport at a Geneva arbitration
court to recover what it said were 61 million euros ($78 million) in debts.