The US has filed charges against Huawei and its chief financial Meng Wanzhou.
America’s Justice Department unsealed a number of criminal charges against the technology giant, two of its subsidiaries and a senior executive.
The company has also been charges in a separate case with stealing trade secrets from T-Mobile, according to federal prosecutors.
Prosecutors are seeking to extradite the company's chief financial officer, Meng Wanzhou, and allege she committed fraud by misleading banks about Huawei's business dealings in Iran.
She was arrested on December 1 in Canada.
US prosecutors say Huawei used a Hong Kong shell company called Skycom to sell equipment in Iran in violation of US sanctions.
Meng misled US banks into believing the two companies were separate, according to the Justice Department.
Huawei is the world's biggest supplier of network gear used by phone and internet companies and has long been seen as a front for spying by the Chinese military or security services.
Prosecutors also allege that Huawei stole trade secrets, including the technology behind a robotic device T-Mobile used to test smartphones, prosecutors said.
A jury in Seattle ruled that Huawei had misappropriated the robotic technology from T-Mobile's lab in Washington state.
The Huawei case has set off a diplomatic spat with the three nations, which has threatened to complicate ties between the US and Canada.
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President Donald Trump said he would get involved in the Huawei case if it would help produce a trade agreement with China, and said in December that he would "intervene if I thought it was necessary".
Additional reporting by agencies.
