I think you're mixing up a few things here...
The entity list the ban is based on is no "international sanction", it's US domestic trade law and thus they do not need to give a good justification or reasons for why they put some company or person on it. They might as well have given IP theft as their justification as they usually do - like they had no qualms about instigating a Section 301 investigation based on IPR related matter and imposing tariffs on $250 billions worth in goods - the aluminium and steel tariffs are btw unrelated and based on different laws (Section 232, the national security clause).
In another case, they simply put a company on the Entity list for "national security" reasons because the manufacturing capacity of their new plant was too big and thus might threaten US manufacturers in the future... If something like that is enough of a justification, I'd argue IP theft, even alleged one, is more than enough. Not to mention, the reason they gave is also quite shaky and doesn't sound like they have any proof on that front either.
I'm also not talking about motives. I'm well aware of what the US is trying to do. I literally wrote the book on that. It is why It is quite sad to see how easy it is for them to manipulate people into chugging along with their ploy and supporting positions that might not necessarily in their interest. It's kinda like what liberals accuse right-wingers of: voting against their interest, although this case is somewhat more complex.
People here seem to cheer the administration for bravely defending their privacy (which, when it comes to the NSA they don't seem to value very much), when in reality the administration doesn't give a shit about them or their dick pics. They didn't even try to frame this as a national security/theft/espionage thing, probably because they know that nobody is going to bother checking anyway. China has been demonized by the US since the Tianmen massacre, in some instances rightfully so, but this also lead to worryingly blind complacency over the last couple of years. Because Americans seem to believe to be on the moral high ground, anything the administration does against "the opponent" will be the just/right thing to do - and we have more than enough examples throughout history to know that is the most slippery slope of all. You wouldn't even need to go back more than 15 years. Heck, we already had more than enough people here demanding war against China ... based on accusations the US had been unable to prove for the last 7 years and hurt national pride. People just "know" these accusations are true because it fits their view of China that has been constructed for over 30 years. That's how we get sensationalist articles like the one from Bloomberg 3 Weeks ago which instigated some of these demands for immediate war - and then turned out to be less than nothing.
It is clear that they want to use Huawei as a bargaining chip in the greater context of IPR protection issues - BUT, and that's the important thing to stress, Huawei in this case was not banned for that. They were officially banned for a completely unrelated thing. And it's dangerous to ignore these details, as it only feeds into people's confirmation bias. That's how we get fake news because what people will take away from this is "ha! I knew it, Huawei steals my stuff and thus they were punished", when that's NOT what is happening, at all.
So, in short: we're in times of war, truth dies first, and you better carefully read what they tell you or you'll soon be looking for your next weapons of mass consumption.