Turkey’s foreign minister says his nation could seem”elsewhere” when the U.S. does not provide F-35 fighter jets.

Mevlut Cavusoglu also said in an interview with private NTV television Tuesday that Turkey could think about obtaining more Russian-made S-400s or other systems to fulfill urgent demands if it can not purchase U.S. Patriot systems.

Turkey’s proceeds to buy the technology have heightened tensions with Washington. U.S. Vice President Mike Pence cautioned that Turkey was denying its NATO membership and its own participation in the F-35 program.

Cavusoglu stated:”If F-35s aren’t delivered, I would be set in a position to buy the planes I need elsewhere.”

He added that a new U.S. supply to sell Patriots has been”more rational” than a previous deal, but still didn’t fulfill Turkey’s expectations.