The United States said Monday it was halting all deliveries and joint work with Turkey on the F-35 fighter jet program after the NATO ally insisted on a major arms purchase from Russia. After months of warnings, the United States said that Turkey’s decision to buy Russia’s S-400 missile system was incompatible with remaining part of the emblematic US warplane program. “Until they forgo delivery of the S-400, the United States has suspended deliveries and activities associated with the stand-up of Turkey’s F-35 operational capability,” Pentagon chief spokesman Charles E. Summers Jr. said.
