The head of Russian state conglomerate Rostec, Sergei Chemezov, said the country would start delivering S-400 missile systems to Turkey in two months, the Interfax news agency reported.
Chemezov added that Russia had finished instructing Turkish specialists on the use of the S-400.
Tensions between Turkey and the United States are running high over Ankara's decision to buy the S-400 missile defences, which are not compatible with NATO systems.