Ankara and Moscow are also discussing potentially co-manufacturing a few components of the jets, Turkish sources said.
Turkey will soon reach a deal with Russia over the purchase of 36 Su-35 fighter jets, Turkish sources told Daily Sabah on Friday.
Ankara and Moscow are also discussing potentially co-manufacturing a few components of the jets, including its precision weapons and ammunition, the sources added.
Ankara and Moscow have been in talks over the sale of Russian-made Sukhoi Su-35 fighter jets since late September.
During a visit to the International Aviation and Space Salon MAKS-2019 on August 27, Turkey's President Recep Tayyip Erdogan was shown the last generation of Russian stealth aircraft, Su-57 fighter jet. He also examined Su-35 fighter jets, Ka-52 military helicopter and Mi-38 transport helicopter.
Turkey has been at odds with the United States over its purchase of Russian S-400 missile systems.
Following protracted efforts to purchase an air defence system from the US with no success, Ankara signed a supply contract in April 2017 to purchase Russian S-400s.
US officials urged Turkey to buy US Patriot missiles, arguing the Russian system would be incompatible with NATO systems and will expose the F-35s to possible Russian subterfuge.
Turkey, however, said the S-400 would not be integrated into NATO systems and would not pose a threat to the alliance.