FILE PHOTO: A Lockheed Martin F-35 aircraft is seen at the ILA Air Show in Berlin, Germany, April 25, 2018. REUTERS/Axel Schmidt/File Photo

ISTANBUL (Reuters) - Turkey has purchased Russian missile defenses and is discussing a delivery date irrespective of any U.S. sanctions, Foreign Minister Mevlut Cavusoglu said on Monday, adding the United States is isolated as it also squeezes Turkey on F-35 jets.

The Pentagon announced earlier this month that training by Turkish pilots on F-35 fighter jets had been halted at a U.S. air base in Arizona following Turkey’s purchase of Russian S-400 defense systems.

The NATO allies have been at loggerheads over the issue for months. Washington says the S-400 is incompatible with NATO’s defense network and could compromise its F-35 fighter jets, an aircraft Turkey is helping build and planning to buy.

Speaking at a news conference Ankara, Cavusoglu said partner nations in the F-35 jet program do not support the steps taken by the United States to halt pilot training.

“Whatever sanctions will be decided, whatever statement would come from the United States, we have purchased S-400s and right now we are talking about when they will be delivered,” Cavusoglu said.

Buying military equipment from Russia leaves Turkey vulnerable to U.S. retribution under a 2017 law known as the Countering America’s Adversaries Through Sanctions Act, or CAATSA.

Turkish President Tayyip Erdogan said on Thursday that he would discuss the issue with U.S. President Donald Trump at the G20 summit in Japan this week.