The two allies have recently been at odds on oil prices, which has inflicted heavy damage on the American oil industry.
The Turkish president says that giving up the Russian missile defence system would be an interference in Turkey's sovereignty rights but is open to buying the US's Patriot missile defence system as well.
The 17th plane carrying the hardware for long-range air defence system arrived in Turkey's capital Ankara on Thursday.
Subscribe to our Youtube channel for all latest in-depth, on the ground reporting from around the world.
Copyright © 2020 TRT World.