The press conference reportedly was canceled after a phone call between Turkish National Defense Secretary Hulusi Akar and U.S. Acting Defense Secretary Mark Esper.

The expected press conference of Pentagon, which is expected to announce a series of sanctions against Ankara after Turkey began taking delivery of S-400 air defense systems from Russia, has been canceled.

"The press conference will be about the response to Turkey's acceptance of the delivery of Russian-made S-400 air defense systems," an initial statement from the Pentagon said. (ILKHA)