Turkish President Recep Tayyip Erdoğan stated on Wednesday that the parliament in Ankara cannot endorse Sweden’s NATO membership application until the United States approves deliveries of F-16 fighter jets to Turkey.

On his way back from Qatar, Erdoğan said, “I expect something from you,” a reference to the US.

“You pass this [F-16 sale] in your Congress and we take these steps together simultaneously,” Erdoğan’s office for communication reportedly stated.

It’s still uncertain whether or when the US Congress would implement the idea. Congress is still somewhat opposed to the deal, despite US President Joe Biden’s support for it.

The Turkish parliament has not ratified Sweden’s NATO membership since October, when Erdoğan sent it, after months-long opposition over Stockholm’s alleged support to groups Ankara considers “terrorist.”

NATO allies recently voiced disappointment over the prolonged process in Ankara.

Sweden lacks the approval of Turkey and also Hungary.