The F-35 Joint Program Office says the upgraded jet is showing software troubles in flight tests, prompting it to push the schedule back.
GhostEye MR is a medium-range radar that can detect, track and identify threats including cruise missiles and drones.
The Patriot can target aircraft, cruise missiles and shorter-range ballistic missiles. Russia has used that weaponry to bombard Ukraine.
By Adam Pemble
China announced the sanctions in February but gave few details then.
By Huizhong Wu, AP
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