According to the article, it wasn't the NSA that put backdoors in Huawei devices, it was Huawei. It sounds like like any intelligence agency that can bribe a Huawei support engineer has access to any Huawei networking device. That definitely includes the Chinese and the American intelligence agencies.
The US intelligence agencies can simultaneously act to protect the information security of American businesses by warning people of the vulnerability AND act to exploit the vulnerability for their own intelligence-gathering goals.
The US intelligence agencies can simultaneously act to protect the information security of American businesses by warning people of the vulnerability AND act to exploit the vulnerability for their own intelligence-gathering goals.