Yes, the US was wrong to abandon the nuclear deal with Iran.

But that's not the whole story with the Huawei CFO arrest.

China and their state-owned and state-controlled companies are stealing trade secrets and military technology instead of developing it on their own.

Chinese companies enjoy open access to Western markets, but Western companies are highly restricted in their access to Chinese markets.

If Huawei illegally sold technology to sanctioned nations, and the US can use that to pressure China on trade and espionage, more power to them.