WASHINGTON (REUTERS) - The United States sent Navy and Coast Guard ships through the Taiwan Strait on Sunday (March 24), the US military said, as part of an increase in the frequency of movement through the strategic waterway despite opposition from China.
The voyage risks raising tensions with China further but will likely be viewed by self-ruled Taiwan as a sign of support from Washington amid growing friction between Taipei and Beijing.
The two ships were identified as the Navy destroyer Curtis Wilbur and the Coast Guard cutter Bertholf, a US military statement said.
"The ships' transit through the Taiwan Strait demonstrates the US commitment to a free and open Indo-Pacific," the statement said. "The US will continue to fly, sail and operate anywhere international law allows," it added.
Chinese Foreign Ministry spokesman Geng Shuang told reporters in Beijing that China had already lodged "representations" with the US, and that it had paid "close attention" to the US ships.
China urges the US to "cautiously and appropriately handle the Taiwan issue to avoid harming Sino-US relations and peace and stability in the Taiwan strait", Mr Geng said.
In Taipei, Taiwan's Defence Ministry said the ships had passed through the Taiwan Strait from the south-west and proceeded in a northerly direction.
Taiwan's armed forces monitored their progress to "ensure regional stability and security of the coastal border region", the ministry said, adding that nothing out of the ordinary was observed and there was no cause for alarm.
Taiwan is one of a growing number of flashpoints in the US-China relationship, which also include a trade war, US sanctions and China's increasingly muscular military posture in the South China Sea, where the US also conducts freedom of navigation patrols.
Taiwan President Tsai Ing-wen, to China's anger, will have a stopover in Hawaii this week at the end of a tour of the Pacific.
Washington has no formal ties with Taiwan but is bound by law to help provide the democratic island with the means to defend itself, and is its main source of arms.
The Pentagon says the US has sold Taiwan more than US$15 billion (S$20.2 billion) in weaponry since 2010.
Beijing has been ramping up pressure to assert its sovereignty over the island, which it considers a wayward province of "one China" and sacred Chinese territory.
China has repeatedly sent military aircraft and ships to circle Taiwan during drills in the past few years and worked to isolate the island internationally, whittling down its few remaining diplomatic allies.
The US Defence Intelligence Agency released a report earlier this year describing Taiwan as the "primary driver" for China's military modernisation, which it said had made major advances in recent years.
US President Donald Trump has said trade negotiations with China were progressing and a final agreement "will probably happen", adding that his call for tariffs to remain on Chinese imported goods for some time did not mean talks were in trouble.