Turkish President Erdogan says he hopes a Russian missile system that Washington sees as a threat to US jets will be delivered in July.
The United States had said that Turkey could not have both the S-400 aircraft's defense system and the American F-35 fighter aircraft.
But Mr Erdogan said that Turkey would hold account for anyone who excludes Turkey from the F-35 program.
NATO member Turkey has signed up to buy 1
Turkish companies produce 937 of the planet's parts.
Mr Erdogan said he hoped to resolve the situation with the United States via telephone diplomacy before a meeting with President Trump in late June, Reuters reported.
Turkey has pursued an increasingly independent defense policy and has established closer relations with Russia
US Defense Secretary Patrick Shanahan wrote last week to his Turkish counterpart that the United States was "disappointed" " to hear that Turkish staff have been sent to Russia to train on S-400.
Another leading US official, Defense Minister Ellen Lord, told reporters that the United States did not want Russian techniques to be able to access F-35's vulnerabilities
"We do not want the F-35 near S-400 over a period of time because of the ability to understand the profile of F-35 on it
US officials wished Turkey would buy its patriotic missile system instead .
Turkey has the second largest army in NATO, a military alliance with 29 members established to defend itself against what was then the Soviet Union.
What is the S-400 system?  The S-400 "Triumph" is one of the world's most sophisticated surface-to-air missile systems.
It has a range of 400km (250 miles) and an S-400 integrated system can shoot up to 80 targets simultaneously.
Russia says it can hit antenna targets ranging from low-flying drones to aircraft flying at different heights and long-distance missiles.
How does the S-400 work?
- Long-term monitoring radar tracks objects and relays information to the command vehicle, which assesses potential targets
- Goals are identified and command vehicles missile launch
- Launch data is sent to the best-placed launch vehicle and it releases air missiles
- Commitment radar helps control missiles against the goal