Turkey has already bought S-400 defense systems from Russia and hopes they will be delivered in July, Turkish President Tayyip Erdogan said on Wednesday, an announcement likely to ratchet up tensions with Washington on the issue.

Axar.az reports citing Al-Arabiya.

“Turkey has already bought S-400 defense systems. It is a done deal. I hope these systems will be delivered to our country next month,” Erdogan said.

Turkey and the United States have sparred publicly for months over Ankara’s order for the S-400s, which are not compatible with NATO’s systems.

US acting Secretary of Defense Patrick Shanahan outlined last week how Turkey would be pulled out of the F-35 fighter jet program unless Ankara changed course from its plans to purchase the S-400 missile defense system.

Speaking at a meeting of his AK Party members, Erdogan said Turkey will hold to account anyone who excludes Turkey from the F-35 program.

“We will hold to account Turkey’s exclusion from F-35 program in every platform due to reasons without reason or legitimacy,” Erdogan said. He noted that Turkey is also a manufacturing partner in the program.

Erdogan also said he wanted to talk about the issue on the phone with the United States, before he meets President Donald Trump in Osaka, Japan at the end of this month.

Russia said on Tuesday it plans to deliver its S-400s to Turkey in July, setting the clock ticking on a US threat to hit Ankara with sanctions if it goes ahead with the deal.