The US Ambassador in Bucharest "spoke badly about the Chinese 5G technology without any reason at all," said the Chinese Embassy's spokesman in Bucharest, Tang Fujian, in a statement released on Tuesday.
The US regulatory body has proposed rules to block the purchase by telecommunications companies of equipment from Chinese companies Huawei and ZTE and remove any of their equipment that is already available.
The Federal Communications Commission said the rules - which will be voted on November 19 - are part of an initiative to "protect the country's communications networks".
Sixth generation 6G telecommunications technologies may become available in the next 10 years. This was stated today by the founder and CEO of Huawei Ren Zhengfei in an interview with Kyodo.
"We have started research on the 6G network and in my opinion within 10 years it can be made available for practical use", he said.
Chinese technology giant Huawei has accused US authorities of trying to force its employees to gather information about the company and break into its information systems, the Associated Press reported.
The company, which has been accused by Washington of threatening the national security, said that top US officials used "unscrupulous measures" to disrupt its business.