"First of all we did not like the word stealing. This is also not accurate," Chinese Foreign Ministry spokesperson Hua Chunying said at a media briefing, hitting back at Trump's charge.
"China steals United States Navy research drone in international waters -- rips it out of water and takes it to China in unprecedented act," Trump tweeted. His claim had come hours after the Chinese government had said it had been in touch with the US military about the incident.
She also denied US allegations that the Chinese naval ship picked it up and took it away despite messages from the US survey ship USNS Bowditch which controlled the drone.
"As really what happened you can see from Defence Ministry statement that the Chinese navy found this unidentified device and examined in a professional manner to verify it," Hua said.
"No matter how they see this unidentified device, most important thing is that Chinese navy took a professional and responsible decision to do this in order to prevent from causing harm to freedom of navigation," she said.
Asked whether China did not know that it belonged to US, she shot back saying, "what is your point. Do you think this fell from the pocket of US?"
However, she said the militaries of both US and Beijing are in close touch to handle this issue smoothly.
"All I can tell you is that the two sides are handling this issues properly handling through smooth military channels," Hua said, adding that she has nothing to offer on specifics like when the drone would be handed over to the US.
The US military had said it was taken away from outside the nine dash line of the South China Sea.
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"Regarding President elect tweets, I noticed there are lot of comments in the world. We will not make any extra comment on that," Hua said.
On the details of the glider, "if you read through the defence ministry statement, you can find the answers," she said. The Chinese navy found this device in the South China Sea, Hua said.
But at the same, Hua accused the US of indulging in close surveillance of the Chinese coast.
While the drone incident is being properly handled, "I want to emphasise that for long time US has been deploying vessels to conduct close reconnaissance and surveys in China's coastal waters. China urges US to stop such activities. We will continue to be vigilant against such activities," she said.
"We are opposed to US deploying vessels and aircraft to conduct surveillance and survey in China's costal waters," she said, without elaborating.
Meanwhile, Chinese state-media attacked Trump for his tweets targeting China, saying that he lacked diplomatic experience and was unfit to lead a super power.
"What is truly amazing about this (Trump) tweet, was the soon-to-be US president completely misrepresented what had actually happened -- that is more dangerous than funny," an editorial in the state-owned China Daily newspaper said.
"Trump is not behaving as a president who will become master of the White House in a month. He bears no sense of how to lead a superpower," said another official daily Global Times, which is known for striking nationalistic postures.
"He bears no sense of how to lead a superpower. Even the US military did not use the term 'steal' to describe the move by the Chinese navy. Trump's second tweet makes people worry that he will treat China-US relations as child's play," it said.
"Since he has not taken office, China has kept a calm attitude toward his provocative remarks. But if he treats China after assuming office in the same wayas in his tweets, China will not exercise restraint," it said.
