LI In Europe - and most of the 3GPP world
Dear US - Technical capability for Lawful Interception (LI) is standard on 3GPP network suppliers/operators regardless of race or skin colour.
Over 70 American organisations are members of ETSI - which sets the Standards. Your country has had plenty of opportunity to influence how LI works and what safeguards need to be implemented, and no doubt did.
Calling Huawei out for including a mandatory function in their equipment is very hypocritical. Perhaps you are too wrapped up in telephony history when LI capability was built into a "black box" sat in the corner of a telephone exchange - Now I guess you refer to it as a "yellow box".
For those suffering from insomnia you can read all about it here https://www.etsi.org/committee/1403-li