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"China is our largest market for steel, while the majority of our copper and cobalt also goes to the country," Sobotka said.

"China attaches great importance to President Trump's visit, and I look forward to working with him to outline and advance our bilateral relations in the years to come," Xi said.

"China is not what it was 10 years ago," he said. "We had many difficulties in establishing the company in China, which has a different language and different laws. I've received help from many people before and during the outbreak of the coronavirus.

"China has repeatedly stated its position on the so-called arms control negotiation with the United States and Russia. China has no interest and will not be part of it," the ambassador stressed.

"China Unicom is suffering from a brain drain. Teaming up with internet moguls can help rebuild it as an open and energetic company and boost employee confidence," he said.