"During the meeting, Trump showed a reasonable approach to [our] need to purchase the S-400. It is possible that he will meet with our president [Recep Tayyip Erdogan] in the near future. The talks with Trump were positive and showed the importance he attached to Turkey," the minister said, as cited by the NTV broadcaster.
Berat Albayrak added that "there was a very positive, constructive conversation."
Earlier, Turkish Defence Minister Hulusi Akar said that Russian S-400 air defence systems will not be integrated into any active NATO military systems.
Last month, Turkish Foreign Minister Mevlut Cavusoglu said the agreement to purchase Russian S-400 air defence systems was a "done deal".
In December 2017, Russia and Turkey signed a loan agreement for the delivery of S-400 air defence systems to Ankara. The Russian-Turkish cooperation on S-400 deliveries has been criticised by NATO and the United States, which have cited security concerns and the inability of integration between S-400 and NATO's air defence systems. Ankara, for its part, has said that the purchasing of military equipment is its sovereign affair and ruled out the possibility of abandoning the deal with Moscow.
The first S-400 shipment is expected to be delivered to Ankara in July.