US Secretary of State Antony Blinken has renewed calls for Turkey to ditch Russia’s S-400 missile defense system in his first face-to-face meeting with his Turkish counterpart, Mevlut Cavusoglu, on the sidelines of a NATO ministerial meeting in Brussels today.

“Secretary Blinken urged Turkey to not retain the Russian S-400 air defense system,” the State Department said in a statement. Blinken also warned Cavusoglu of the likely consequences of Turkey getting a second batch of S-400s and Sukhoi S-57 and S-35 war planes — namely a second wave of sanctions from the Hill, diplomatic sources told Al-Monitor.

The NATO allies have been at loggerheads over Turkey’s acquisition of the S-400s despite repeated warnings from Washington over the likely consequences. On Dec. 14, 2020, Turkey’s state defense procurement agency was sanctioned under the Countering America’s Adversaries Through Sanctions Act (CAATSA).

Turkey has not bowed to US pressure and there were no signs of a change in Ankara’s position following today’s bilateral meeting. Briefing reporters after the talks, Cavusoglu said that Turkey had “already bought” the system, that it was “a done deal.” Turkey had repeated its offer, though, to set up a commission with the United States to “clarify technical issues.”