Russia has received an advanced payment from Turkey for the supply of S-400 missile systems, Russian presidential aide Vladimir Kozhin said on Friday.

“The contract has entered into force, the advance payment was made,” he told TASS agenct.

The issue of transferring technology of S-400 production to Ankara has not been discussed yet, he added.

Earlier Turkish Defense Industry Undersecretary Ismail Demir said the supplies of the missile system would start within two years.