"China has lodged solemn representations with the US, urging the US to honour its commitment to the One-China policy," Foreign Ministry spokesperson Geng Shuang said today.
"We have taken note of the relevant reports and made solemn representations about it to the relevant US side. It must be pointed out that there is only one China in the world. Taiwan is an inalienable part of China's territory," he said.
The Government of the People's Republic of China (PRC) is the sole legitimate government representing China, which is a fact recognised by the international community, he said.
"We urge the relevant parties in the US to abide by the commitment to the One-China policy and abide by the principles of the three Sino-US joint communiques, and to handle the Taiwan issue with caution and care to avoid unnecessarily interfering with the overall situation of Sino-US relations," he said in comments posted on the Foreign Ministry website.
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Geng's appeal to "relevant parties" came after reports that Trump bypassed US State Department in talking to Tsai.
Apparently the call came from the Taiwanese President, who is adversely viewed by China as she was elected early this year on anti-China platform.
"I do not think it will change the One-China policy that the US government has insisted on applying over the years," Wang said, Hong Kong-based Phoenix TV reported.
"The One-China policy is the cornerstone of the healthy development of China-US relations and we hope this political foundation will not be interfered with or damaged," Wang said after Trump spoke to Tsai, a striking break with decades of US diplomatic practice not to directly speak with Taiwan leader.
Like most of the countries in the world, US too pursued a so-called "One-China" policy since 1979, when it shifted its diplomatic recognition by formally recognising People's Republic of China (PRC) instead of Taiwan which broke off with mainland in 1949 after the formation of the PRC.
China is trying to open up its channels with Trump as
President Xi Jinping yesterday met former US Secretary of State Henry Kissinger who is widely regarded as part of back channel diplomacy between both the countries.
He said the mutual benefits of relations between the two countries outweigh their differences, and China is willing to work with the US for a smooth transition following last month's presidential election.
Xi said China and the US should continuously promote the new type of major power relations, and strengthen their coordination on international affairs.
Kissinger, a regular visitor to China, said the US-China relationship is important to the two countries, as well as the world as a whole. He hoped he can keep playing an active role in boosting the relationship.
A statement from Trump's transition team said he spoke with Tsai, who offered her congratulations.
Trump tweeted later: "The President of Taiwan CALLED ME today to wish me congratulations on winning the Presidency. Thank you!"
The Taiwanese presidential office also issued a statement saying Trump and Tsai discussed issues affecting Asia and the future of US relations with Taiwan.