Al Jazeera reported that China's request was made by the Asian country's Foreign Ministry spokeswoman, Mao Ning.

US President Donald Trump recently ordered his country to return to its nuclear weapons testing.

Trump said that countries like Russia and China are conducting secret underground nuclear weapons tests.

However, a Chinese foreign ministry spokeswoman was quoted as saying that we have never conducted any tests.

Russian officials have also previously said they have not returned to nuclear weapons testing.

It has been more than 30 years since the nuclear-weapon states agreed to stop testing.

US President Donald Trump discussed trade, nuclear weapons and other global issues with his Chinese counterpart a week ago.

President Donald Trump has ordered his country to conduct its first nuclear test in 30 years.