ANKARA (Reuters) – Turkey warned on Wednesday that it could purchase jets and additional air defense systems from Russia if it cannot get Patriot missile shields and F-35 jets from Washington, raising the prospect of ever deeper defense ties between Moscow and a NATO member.

President Tayyip Erdogan’s existing plans to buy Russian S-400 missile defenses have already alarmed the United States, which says they are not compatible with NATO systems and would compromise the security of F-35 jets Turkey is due to receive.

Washington has offered Ankara both carrot and stick in response, proposing to sell it the Raytheon Co. Patriot systems instead of the S-400s, while at the same time warning of sanctions and a halt in the F-35 fighter jet sales if the Russian deal goes ahead.

Turkey has shown no sign of giving ground and Erdogan, who held talks with President Vladimir Putin in Moscow this week, was quoted on Wednesday as saying the July date for delivery of the first S-400s could even be brought forward.

Foreign Minister Mevlut Cavusoglu also reiterated Turkey’s stance that the S-400 purchase was a done deal and that it would meet its defense needs from elsewhere if necessary.

“If the United States is willing to sell, then we’ll buy Patriots. However, if the United States doesn’t want to sell, we may buy more S-400s or other systems,” Cavusoglu told Turkish broadcaster NTV.

“If the F-35s don’t work out, I will again have to procure the jets I need from elsewhere … There are (Russian) SU-34, SU-57 and others. I will absolutely meet my needs from somewhere until I can produce it myself,” he said.