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The US says it is removing Turkey from its F-35 fighter jets programme, after Ankara received the first parts of a Russian missile defence system.
The US says the "F-35 cannot coexist with a Russian intelligence collection platform that will be used to learn about its advanced capabilities".
Russia began delivering its advanced S-400 system to Turkey last week.
Turkey and the US are key Nato allies - but Ankara has also been establishing closer links with Russia.
In a statement on Wednesday, White House spokeswoman Stephanie Grisham said: "Unfortunately, Turkey's decision to purchase Russian S-400 air defence systems renders its continued involvement with the F-35 impossible.
"The United States has been actively working with Turkey to provide air defence solutions to meet its legitimate air defence needs, and this administration has made multiple offers to move Turkey to the front of the line to receive the US Patriot air defence system.
"Turkey has been a longstanding and trusted partner and Nato ally for over 65 years, but accepting the S-400 undermines the commitments all Nato allies made to each other to move away from Russian systems."
At the same time Ms Grisham stressed that "the United States still greatly values our strategic relationship with Turkey.
"As Nato allies, our relationship is multi-layered, and not solely focused on the F-35," she said.
What are your thoughts on the current situation? In my opinion I thought that Turkey had this coming. Because of their interactions with Russia and the tensions that have been apparent between NATO and Russia, this was bound to happen soon. I doubt anything worse would happen, as Turkey has the second-largest military in NATO, an alliance with twenty-nine member states, so they are rather important.
