"The United States has been very clear about how we view Turkey’s purchase of the S-400. We oppose the purchase of the S-400," Jones said during an online briefing. "We will continue to discuss with Turkey issues related to the S-400 both through our bilateral contacts with Turkey and here at NATO. And we will continue to work here at NATO together as we plot the way ahead."
Jones reiterated the United States’ stance that the presence of "a large Russian weapon system such as the S-400" has no place in NATO.
"It also contravenes commitments that allies made to each other that we would wind off the dependency on Russian weapons systems," he said.
Jones praised Turkey as "a very valued ally" in NATO and a strong supporter of the alliance and a major contributor to its operations.
The purchase of S-400 batteries has been a major flashpoint of tensions in US-Turkey relations since 2019. The United States demands that Turkey abandon the deal in favour of US-made Patriot systems. It has suspended Turkey's participation in the F-35 jet program and imposed sanctions on the Turkish Presidency of Defense Industries under the Countering America's Adversaries Through Sanctions Act (CAATSA).