Chinese fighter jets briefly crossed the median line of the sensitive Taiwan Strait on Monday morning before being "driven out" by Taiwan's air force, the island's defense ministry said.
The Chinese fighters were also tracked by Taiwan's land-based anti-aircraft missiles, the ministry said, citing the air force.
The incident took place on the first full day of a high profile visit to Taiwan by U.S. Health Secretary Alex Azar, which China has condemned. China views Taiwan as its own territory, with no right to state-to-state ties.