US forces training Taiwanese troops in secret: report

US special forces have been training Taiwanese soldiers for almost a year now, said an American media report, as tensions between China and Taiwan remain high. 

The official largely confirmed a Wall Street Journal report which said the training has been going on for at least a year, amid China's rising verbal threats against the island ally of the United States.

Taiwan's Defence Ministry declined to comment on the report, but Pentagon spokesman John Supple said that generally speaking, US support for Taiwan's military is gauged on its defence needs.

"Our support for and defence relationship with Taiwan remains aligned against the current threat posed by the People´s Republic of China," Supple said in a statement.

"We urge Beijing to honor its commitment to the peaceful resolution of cross-Strait differences."

Taiwan's Premier Su Tseng-chang said "a just cause always attracts much support" when asked to comment on the Wall Street Journal report on Friday.

"We are making every effort to defend our national sovereignty and our people as well as maintaining regional peace. We are doing all we can and we appreciate like-minded countries working together," he said.

Taiwan media reported last November, citing Taiwan's Naval Command, that US troops had arrived there to train Taiwan marines and special forces in small-boat and amphibious operations.

But those reports were subsequently denied by US and Taiwanese officials, who emphasized the two sides are only involved in bilateral military exchanges and cooperation.

The United States supplies weapons to Taiwan, including missiles for defence and fighter jets, amid Beijing's threat to forcibly retake control of the island and reintegrate it with China.

The US also maintains an ambiguous commitment to defend Taiwan, which Beijing considers a renegade province.

A video released last year and featured in Taiwan media showed US troops taking part in an exercise on the island dubbed "Balance Tamper."

Chinese forces have stepped up their activities toward Taiwan in the past year, conducting sea assault exercises and flying large sorties of bombers and fighters close to Taiwan airspace.

Taiwan's defence minister said Wednesday that military tensions between the island and China are at their highest in four decades, after around 150 Chinese warplanes -- a record number -- made incursions into its air defence zone in recent days.

He warned that even "slight carelessness" or "miscalculation" could spark a crisis, and that Beijing would be in a position to launch a full-scale invasion in four years.

US State Department Spokesman Ned Price called the Chinese activity "destabilizing" and "provocative."

"We strongly urge Beijing to cease its military, diplomatic and economic pressure and coercion against Taiwan," he said, calling US commitment to the island "rock-solid".

"Let me just say this, we are going to take action now to try to prevent that day from ever coming to pass," national security adviser Jake Sullivan told the BBC when asked if Washington was prepared to take military actions to defend Taiwan.