Washington claims the purchase will jeopardize Turkey's role in the F-35 fighter jet program and has threatened sanctions.
Turkey has said there is no conflict between the S-400 and the F-35 and has called for a working group to clarify the issue.
Turkey's TK129 ATAK multirole combat helicopter also joined the prestigious show with a demonstration flight.
With its high performance and maneuverability, as well as with durability against heavy blows and ballistic strikes, the ATAK helicopter provides its pilots with superior operational capability.