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Chinese telecoms giant Huawei has been the focus of intense international scrutiny lately.
Several countries have raised security concerns about its products, and this week Germany considered blocking it from its next generation mobile network.
The company is also accused of stealing trade secrets in the US, and its chief financial officer Meng Wanzhou is under house arrest in Canada.
There are fears that China is using Huawei as a proxy so it can spy on rival nations and scoop up useful information. Huawei has said it is independent and gives nothing to the country's government, apart from relevant taxes.
Critics question how free any major Chinese business can be from Beijing's influence. They point out that its media-shy founder Ren Zhengfei was a former engineer in the country's army and joined the Communist Party in 1978.
Huawei is keen to portray itself as a private company owned by its employees with no ties to the Chinese government beyond those of a law-abiding taxpayer.
October 2012: A US congressional panel warns that Huawei and rival ZTE pose a security threat, following an investigation
July 2013: The company denies claims made by a former US Central Intelligence Agency (CIA) chief that it spied for the Chinese government
October 2014: The company says a ban on bidding for US government contracts is "not very important"
19 July 2018: A UK government report says it has "only limited assurance" that Huawei's broadband and mobile infrastructure equipment poses no threat to national security
30 July: Huawei overtakes Apple to become the world's second-biggest smartphone-maker, according to market analysts
23 August: Australia says Huawei and rival firm ZTE will be excluded from its next generation 5G network, citing security fears
28 November: New Zealand excludes Huawei from its 5G network
1 December: Huawei chief financial officer Meng Wanzhou is arrested in Vancouver, Canada
7 December: At a court hearing, it is revealed that Ms Wanzhou is wanted in the US on fraud charges relating to the alleged breaking of US sanctions on Iran
24 December: BT confirms that Huawei equipment is being removed from the heart of a communication system being developed for the UK's emergency services
4 January 2019: Two Huawei employees are punished after posting a new year message on the company's Twitter account using an iPhone
12 January: Huawei sacks an employee who was arrested in Poland on suspicion of spying. The company said Wang Weijing acted on his own
15 January: In a rare interview, Huawei founder Ren Zhengfei denies Chinese authorities have ever asked his company to help spy on its clients
16 January: The Wall Street Journal reports that the US is investigating Huawei for "stealing trade secrets" from American business partners
17 January: The University of Oxford confirms it has suspended new donations and sponsorships from Huawei
Huawei can lay claim to being one of the biggest spenders on research and development. It invested more than $13.2bn (£10.2bn) in 2017 and has said the figure will be even higher for 2018.
Huawei is now the second biggest smartphone-maker after Samsung
But critics fear that the Chinese government could order the firm to modify its devices to help hack attacks, eavesdrop on conversations or gain high-level access to sensitive networks.
There are questions about whether China would allow a technology firm that has been deeply embedded in rival nations' infrastructure to remain independent. Huawei is now the second biggest smartphone-maker in the world.
The UK has not enacted a ban on the use of Huawei equipment. However, the firm's products are regularly subjected to security testing by the UK's GCHQ intelligence agency.
The co-operative agreement between the UK and Huawei includes a facility nicknamed the Cell in Banbury, Oxfordshire. There, staff employed by Huawei but answering to GCHQ, look for security flaws in the company's products.
The last report GCHQ produced said it found "shortcomings" in products that meant it could only give "limited assurance" that the firm posed no threat.
Huawei has previously agreed to a series of technical demands by GCHQ that would harden its products against attackers.
Ms Meng faces extradition to the US on fraud charges
Ms Meng was arrested while transferring between flights in Vancouver, although her detention was not revealed by Canadian authorities until four days later, the day of her first court appearance.
Details of the charges were also not revealed at the time, after she was granted a publication ban by a Canadian judge.
But at a bail hearing at the Supreme Court of British Columbia, a Canadian government lawyer said Ms Meng had used a Huawei subsidiary called Skycom to evade sanctions on Iran between 2009 and 2014.
The court was told she had publicly misrepresented Skycom as being a separate company.
China has demanded Ms Meng's release, insisting she has not violated any laws.
In a statement, Huawei said it was not aware of any wrongdoing by Ms Meng, adding: "The company believes the Canadian and US legal systems will ultimately reach a just conclusion.
"Huawei complies with all applicable laws and regulations where it operates, including applicable export control and sanction laws and regulations of the UN, US and EU."
