U.S. and Taiwan navies reportedly held secret Pacific drills in April

The U.S. and Taiwan navies conducted joint drills in the Pacific in April that, officially, did not take place, four people briefed on the matter said, as the two militaries boost cooperation amid rising Chinese military threats.

Washington and Taipei have been expanding their military cooperation in recent years amid almost daily Chinese incursions into Taiwan's air defense identification zone and drills by Chinese forces near the island.

U.S.-Taiwan military engagement, including visits and training, are kept low-key and are often not officially confirmed because of China's objection to any military contacts between Washington and Taipei. China claims democratically governed Taiwan as its own territory, which the island strongly rejects.

The drills, which were not publicized, took place last month in the Western Pacific, according to the sources, who requested anonymity given the sensitivity of the matter.

One source said "multiple military assets" were involved. A second source said the drills did not officially exist and were dubbed "unplanned sea encounters", pointing to a tacit agreement in which both sides claim the exercises were simply the result of coincidental encounters.

"It's like I am dining in this restaurant and you also happen to be here," the source said. "Then it looks like I am only sharing the same table with someone."

That source also said about half a dozen navy ships from both sides, including frigates and supply and support vessels, participated in the days-long exercises, which were designed to practice "basic" operations such as communications, refueling and resupply.

Taiwan's navy said in a statement to Reuters that to handle unexpected scenarios at sea and to minimize "interference" with each