CHINESE Ambassador to Manila Huang Xilian on Tuesday reminded the Philippines to "strictly abide by the One-China Principle" amid the controversy stemming from the forthcoming visit of Speaker Nancy Pelosi of the US House of Representatives to Taiwan.

"This position is clear and consistent. There is only one China in the world. Taiwan is an inalienable part of China's territory," Huang said in a television interview, reiterating Beijing's "firm" opposition to any official exchange or visit between US and Taiwan leaders.

Huang said this was also "the political foundation of China-Philippines relations. It is our hope that the Philippine side will strictly abide by the one-China principle and handle all Taiwan-related issues with prudence to ensure sound and steady development of China-Philippines relations".

Citing Pelosi's visit to the "Taiwan region of China" during her trip to Asia, Huang said the trip may "send a gravely wrong signal to Taiwan independence separatist forces".

He said that China has made solemn representation to the US side on multiple occasions and "publicly expressed our strong objection to such a potential visit".

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"The government of the People's Republic of China is the sole legal government representing the whole of China," Huang said.

He said that the one-China principle is the political foundation of the diplomatic relations between China and 181 countries in the world, including the US.

"It is also at the core of the three Sino-US joint communiqués. The US made a solemn commitment to China that the US pursues a one-China policy and does not support Taiwan independence," the envoy said.

He added, "Should Speaker Pelosi insist on making a visit to Taiwan region in disregard of China's strong objection, such a visit will seriously violate the one-China principle and the stipulations in the three Sino-US joint communiqués, seriously harm China's sovereignty and territorial integrity, seriously undermine the political foundation of China-US relations, seriously jeopardize peace and stability across the Taiwan Strait."

"As we have made clear, should the US side insist on doing so, China will take strong and resolute measures to safeguard our sovereignty and territorial integrity," Huang stressed.

He said the US side and Taiwan separatist forces "must assume full responsibility for any ensuing consequences."

The one-China principle is an international consensus and universally recognized basic norm governing international relations, he said.

He noted that as one of the three branches of the US government, its US Congress should adhere to the one-China policy. "Speaker Pelosi is second in the US presidential line of succession."