Huawei is often blamed for stealing information from Nortel that led to Nortel’s bankruptcy, both information about deals being made that let Huawei undercut them and technical product details that allowed Huawei to more easily be a substitute for Nortel products
Nortel collapsed long before Huawei even started competing outside of China in any serious way.
Nortel was severely hit by the bursting of the tech bubble, and then it got caught faking its financial figures. To blame that on Huawei is just a rewrite of history.
If true, how did that have any effect on Nortel? As I said before, Huawei wasn't a serious competitor for Nortel at that point. Nortel's business fell apart (and it started fudging its financials) long before Huawei expanded globally.