Beijing, May 21 (AFP) Huawei founder Ren Zhengfei struck a defiant tone Tuesday against American attempts to block his company's global ambitions, saying the US "underestimates" the telecom giant's strength.

Ren spoke to Chinese state media days after President Donald Trump issued orders aimed at thwarting Huawei's business in the United States, the latest salvo in a months-long effort to stop the company's charge to the top of the leaderboard in next-generation 5G technology.

"The current practice of US politicians underestimates our strength," Ren said, according to CCTV.

"Huawei's 5G will absolutely not be affected. In terms of 5G technologies, others won't be able to catch up with Huawei in two or three years," he said.

Last week, Trump declared a "national emergency" empowering him to blacklist companies seen as "an unacceptable risk to the national security of the United States" -- a move analysts said was clearly aimed at Huawei.

At the same time, the US Commerce Department announced an effective ban on American companies selling or transferring US technology to Huawei.

US internet giant Google, whose Android mobile operating system powers most of the world's smartphones, said this week it was beginning to cut ties with Huawei in light of the ban.

The move could have dramatic implications for Huawei smartphone users, as the telecoms giant will no longer have access to Google's proprietary services -- which include the Gmail and Google Maps apps -- a source close to the matter told AFP.

But the Commerce Department on Monday issued a 90-day reprieve on the ban on the transfer of technology by allowing temporary licences.

"The US 90-day temporary licence does not have much impact on us, we are ready," Ren said.

Half of chips used in Huawei equipment come from the United States and the other half are made by the Chinese company, he said.

"We cannot be isolated from the world," Ren said.

"We can also make the same chips as the US chips, but it doesn't mean we won't buy them," he added.

The Huawei confrontation has been building for years, as the company has raced to a huge advantage over rivals in next-generation 5G mobile technology.

US intelligence believes Huawei is backed by the Chinese military and that its equipment could provide Beijing's intelligence services with a backdoor into the communications networks of rival countries.

For that reason, Washington has pushed its closest allies to reject Huawei technology, a significant challenge given the few alternatives for 5G.

The battle over Huawei has added to tensions in a trade war that has escalated between the world's top two economies, with both sides exchanging steep increases in tariffs as negotiations have faltered.

Asked how long Huawei may face difficult times, Ren said: "You may need to ask Trump about this question, not me." (AFP)

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