U.S. President-elect Donald Trump continued to take jabs at China on Twitter on Saturday after Beijing agreed to give back an underwater U.S. drone it seized this week.

“We should tell China that we don’t want the drone they stole back – let them keep it!” Trump tweeted.

But China said it will return the underwater U.S. drone seized by a naval vessel this week in the South China Sea, both countries said on Saturday, but Beijing complained that Washington had been “hyping up” the incident.

U.S. President-elect Donald Trump, who has vowed to take an aggressive approach in dealing with China over its economic and military policies, jumped on the unusual drone seizure with a pair of provocative tweets, accusing Beijing of stealing the equipment.

The drone, known as an unmanned underwater vehicle (UUV), was taken on Thursday, the first seizure of its kind in recent memory. The Pentagon went public with its complaint after the action and said on Saturday it had secured a deal to get the drone back.

“Through direct engagement with Chinese authorities, we have secured an understanding that the Chinese will return the UUV to the United States,” Pentagon spokesman Peter Cook said in a statement.

The drone, which the Pentagon said was operating lawfully was collecting data about the salinity, temperature and clarity of the water about 50 nautical miles northwest of Subic Bay, off the Philippines.

It was seized just as the USNS Bowditch was about to retrieve it, U.S. officials said.

China’s Defense Ministry said a Chinese naval vessel discovered a piece of “unidentified equipment” and checked it to prevent any navigational safety issues before discovering it was a U.S. drone.

“China decided to return it to the U.S. side in an appropriate manner, and China and the U.S. have all along been in communication about it,” the ministry said on its website.

“During this process, the U.S. side’s unilateral and open hyping up is inappropriate, and is not beneficial to the smooth resolution of this issue. We express regret at this,” it added.

Trump, a Republican who takes office on Jan. 20, waded into the dispute on Twitter early on Saturday from his seaside resort club Mar-a-Lago in Palm Beach, Florida, where he plans to spend the holidays.

“China steals United States Navy research drone in international waters – rips it out of water and takes it to China in unprecedented act,” he said.

After China said it would return the drone, Jason Miller, a spokesman for Trump, tweeted a link to a news story, saying: “@realdonaldtrump gets it done.”

There was, however, no evidence that Trump had played any role. U.S. officials said the negotiations took place in Beijing during the overnight hours in the United States. Miller did not respond to requests for comment.

Hours later, while riding in a motorcade back to his resort, Trump tweeted his second jab. “We should tell China that we don’t want the drone they stole back – let them keep it!” he said.

Trump has previously threatened to declare China a currency manipulator and force changes in U.S.-Chinese trade policy, which he says has led to the greatest theft of American jobs in history.

Trump has also raised questions about the most sensitive part of the U.S.-China relationship: whether Washington would stick to its nearly four-decades-old policy of recognizing that Taiwan is part of “one China.”

After his Nov. 8 election victory, Trump accepted a congratulatory phone call from President Tsai Ing-wen of Taiwan, prompting China to lodge a diplomatic protest.

President Barack Obama said on Friday it was fine for Trump to review Washington’s policy toward Taiwan, but he cautioned that a shift could lead to significant consequences in the U.S. relationship with Beijing.

“There’s probably no bilateral relationship that carries more significance and where there’s also the potential, if that relationship breaks down or goes into a full-conflict mode, that everybody is worse off,” Obama told reporters. REUTERS