https://www.theguardian.com/technology/2019/apr/19/where-huawei-is-banned

Several countries have rejected Chinese telecoms firm over national security fears

Politicians in the US have alleged that Huawei’s forthcoming 5G mobile phone networks could be hacked by Chinese spies to eavesdrop on sensitive phone calls, gain access to counter-terrorist operations – and potentially even kill targets by crashing driverless cars. Allies who allow Huawei technology inside their 5G networks have been told they may be frozen out of US intelligence sharing.