New York (CNN Business) Chinese billionaire and Alibaba co-founder Jack Ma said he will donate 500,000 coronavirus testing kits and one million face masks to the United States.

The kits and masks have been sourced and are ready to be delivered, he said Friday on Twitter and Weibo, China's micro-blogging platform.

"Drawing from my own country's experience, speedy and accurate testing and adequate personal protective equipment for medical professionals are most effective in preventing the spread of the virus," Jack Ma said in a statement. "We hope that our donation can help Americans fight against the pandemic!"

Ma's offer came just hours after US President Donald Trump declared a national emergency to free up $50 billion in federal resources to combat coronavirus amid criticism authorities had been too slow to test and respond as the disease spread from Asia to America's shores.

Ma has donated one million masks to Japan as of March 2 and had been attempting to ship one million masks to Iran as of March 6, according to his Weibo posts. In a March 11 post, he wrote that 1.8 million masks and 100,000 testing kits would go to Europe, with the first batch arriving in Belgium this week. He shared plans to donate to Italy and Spain, two other countries hard-hit by the virus, as well.

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