They act in their own interests, you make it sound like sanctions are the state of nature.
It is common practice in China itself. It is how they have dealt with pretty much everything so far. Why is it surprising the US follows suit?
I heard 3 generations behind which is about 5 years. They also used components from south korea against sanctions. It is not fully domestic and that should hardly be a surprise.
Tech blogs and the like have long compared the specs and the conclusion was a difference of 3 generations to other high end phones which I was told is a 5 year gap. And if it really had been a fully domestic chip, developing it this quickly would have been quite the achievement actually. But parts from south korea were found so that was a short celebration.