Re: US sanctions
It wasn't just that it was cheaper. In most cases it was more stable (because it wasn't overloaded with code) and didn't have stupid extra nickel&diming license restrictions for "features"
Cisco itself took over the market from 3com and Bay Networks by doing exactly the same thing in the 1990s but that was OK because everyone was American
I do like pointing out that the big 2016 "video presentation on how insecure Huawei kit is", turned out to be a presentation about how bad the comware (3com licensed) joint venture stuff was that Huawei had recently abandoned in favour of Wind River Linux - and the holes demonstrated were all still present in HP/3com equipment for a long time after that presentation was aired