Beijing 'seriously concerned' as Taiwan's Tsai Ing-wen reportedly set to meet US House Speaker on transit stop

Beijing has expressed grave concerns over Taiwanese President Tsai Ing-wen's reported plans to meet the US House of Representatives speaker during a transit stop there, with Chinese observers warning of another cross-strait crisis.

This came as the Presidential Office in Taipei said on Wednesday that relevant departments were working on certain plans and transit arrangements, without elaborating further.

While the office did not name Tsai, House Speaker Kevin McCarthy confirmed on Tuesday that he would be meeting her in the US this year instead of Taiwan, according to Bloomberg.

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The senior Republican also emphasised that the meeting did not preclude a later visit to the self-governed island, Bloomberg said.

The Financial Times on Monday was the first to report on McCarthy's plans to see Tsai in his home state of California instead of Taiwan, citing caution from Taipei. It said the meeting was likely to take place in April.

The Chinese foreign ministry said it was "seriously concerned about the news".

"We have lodged solemn representations with the US side and asked them to clarify," ministry spokeswoman Mao Ning said on Wednesday.

Beijing was firmly opposed to any form of official exchange between the United States and Taiwan, she said, adding: "No one should underestimate the strong determination of the Chinese government and people to safeguard national sovereignty and territorial integrity.

"The real threat to peace and stability in the Taiwan Strait is the separatist forces of Taiwan independence."

Analysts in mainland China said Beijing was likely to take a series of retaliatory steps if the meeting went ahead. The response could involve military force, which one observer said might be "more severe" than seen after McCarthy's predecessor Nancy Pelosi visited Taiwan last August despite Beijing repeatedly warning against it.

Li Fei, a researcher at Xiamen University's Taiwan Research Institute, said both McCarthy's planned trip to Taiwan and Tsai's possible meeting with Washington's No 3 official on US soil would be viewed by Beijing as a challenge to its "red line" on Taiwan.

"I don't think Beijing would see much difference between the two [arrangements] and [it] is almost certainly going to take forceful measures to retaliate if Tsai's trip goes ahead," he said.

Beijing sees Taiwan as a breakaway province and has not ruled out the use of force to achieve reunification. While the US, like most countries, does not regard self-governed Taiwan as an independent state, it is opposed to any move to take back the island by force.