"We have resolved all technical issues, only the administrative ones remained," Sergey Chemezov told reporters on the sidelines of the MAKS-2017 air show.
"The final decision will be made by the Russian and Turkish governments. Negotiations with the [Russian] Ministry of Finance are underway and, most likely, some funds for this project will be provided by Turkey itself, and some will be received in the form of a loan," Chemezov added.
Meanwhile, Turkish Defense Minister Fikri Isik said Tuesday that the negotiations regarding Russia's delivery of S-400 air defense systems to Turkey have reached the final stage.
"We have approached the final stage with regard to S-400. Namely, the talks are about to have a positive outcome. However, one cannot say that the issue is closed until the signatures are put. We are at the final stage and no problems are foreseen," Isik said, as quoted by the Yeni Safak newspaper.
The negotiations on possible deliveries of the Russian S-400 air defense systems to Turkey have taken place since 2016. In March, Chemezov said Ankara was ready to buy the S-400 systems with a loan granted by Moscow.
On May 3, Kremlin spokesman Dmitry Peskov said Russian President Vladimir Putin had discussed the supplies of S-400 systems with his Turkish counterpart Recep Tayyip Erdogan during their meeting in Sochi, stressing that the issue of S-400 was a "sensitive" one.
The S-400 Triumf, which NATO refers to as the SA-21 Growler, was developed by the Almaz-Antey defense contractor and manufactured by the Fakel Machine-Building Design Bureau. The system is capable of intercepting all types of modern air weaponry, including fifth-generation warplanes, as well as ballistic and cruise missiles at a maximum range of nearly 250 miles.