Beijing has warned the incoming US administration that any attempt to challenge the "One China" policy could impact on peace in the Taiwan Strait.

Interference may also damage developing US-China relations, a spokesman said.

Under the "One China" policy, the US has formal ties with China rather than the island of Taiwan, which China sees as a breakaway province.

However, US President-elect Donald Trump has expressed doubts about continuing to abide by the policy.

Mr Trump had already angered China by taking a phone call from Taiwan's President Tsai Ing-wen, and then tweeting about it.

On Monday, China said it was "seriously concerned" by Mr Trump's comments, and urged sensitivity around the issue.

But An Fengshan, a spokesman for China's policy-making Taiwan Affairs Office, went further on Wednesday, warning of more serious consequences.

"Upholding the "One China" principle is the political basis of developing China-US relations, and is the cornerstone of peace and stability in the Taiwan Strait," he said.

"If this basis is interfered with or damaged then the healthy, stable development of China-US relations is out of the question, and peace and stability in the Taiwan Strait will be seriously impacted," he added.

Mr An's comments came as Admiral Harry Harris, head of the US Pacific Command, vowed the US will keep challenging Beijing's "assertive, aggressive behaviour in the South China Sea".

(Source: BBC)