Turkey cannot accept the United States’ demands concerning the purchase of Russian S-400 missile systems, Turkish Foreign Minister Mevlut Cavusoglu said.
"We cannot accept the United States’ persistent demands on the S-400 matter," Anadolu Agency cited the minister as saying.
The U.S. 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. Ankara is set to take delivery of the first S-400 as early as next month.
U.S. Acting Defense Secretary Patrick Shanahan said in a letter to his Turkish counterpart last week that the training of Turkish pilots will end July 31.
