Re: Just curious
US can levy sanctions against any country it likes, just like any other country. We had sanction against South Africa, some countries have sanctions against Israel - just recently Malaysia tried to ban Israel Paralympic athletes from a swimming competition in preparation for Tokyo, but it played against it.
Or just look at how China pressures to avoid countries recognize Taiwan independence - or Tibet.
Because a lot depend on how many allies you can bring on your side. Still companies operating inside US have to abide to rules.
If Huawei operated with Iran simply out of China, US could have done little but to ban Huawei kits - and maybe deny Ms. Huawei a visa.
Evidently if she operated from US too it will fall under US jurisdiction.