https://www.reuters.com/article/us-australia-china-huawei/australia-spy-chief-says-5g-risks-high-in-nod-to-china-firms-exclusion-idUSKCN1N40AW >Australia must restrict foreign firms with government ties from its 5G mobile communications network because it is critical infrastructure, the head of one of the country's intelligence agencies said, helping to explain why China's Huawei was banned.