Is technology giant Huawei a private and independent company, as its leaders contend, or a spying front for the Chinese government, as US officials suggest?

Despite prolonged administrative and Congressional investigations the US has not produced any evidence to substantiate its allegations.

Instead the US National Security Agency has been prying into the servers of Huawei's sealed headquarters, according to revelations by The New York Times and Der Spiegel, which the US has not denied.