Taiwan's President Tsai Ing-wen on Saturday congratulated US President Donald Trump just hours after his oath taking ceremony. Instead of a phone call, this time the Taiwanese leader resorted to Twitter.

"Congratulations @realDonaldTrump. Democracy is what ties Taiwan and the US together. Look forward to advancing our friendship & partnership," Tsai tweeted.

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Tsai noted that the US is Taiwan's "most important international ally." She stated that both countries shared many common virtues including freedom and democracy.

China is apparently anxious about the US relations with Taiwan under the Trump administration. Trump made unexpected overtures to the self-ruled island nation following his stunning election victory last year.

The Republican leader first broke a decade-long diplomatic protocol by accepting a congratulatory phone call from Tsai. Later, he made a bolder move by openly questioning the US government's commitment to the "One China policy."

Trump was very critical of China even during his election campaign. He has repeatedly slammed the country's controversial trade practices.  

Meanwhile, Taiwan has dismissed China's objection to the presence of a Taiwanese delegation at Trump's swearing-in ceremony, describing the objection as a "pretty concern."

Taiwan's former Prime Minister Yu Shyi-kun who led the delegation told The Associated Press: "it's hard to believe that a country with 5,000 years of history and its glorious background is so focused on this. It just shows how petty they are."

Earlier this week, China urged the US government to stop the Taiwanese delegation from attending Trump's coronation ceremony.  

TagsTsai Ing-wen, donald trump, Taiwan and U.S, Taiwan and China