Taiwan's defence ministry said 10 Chinese planes had crossed the Taiwan Strait Midline, an unofficial barrier between the two sides.

Taipei said it sent fighter jets to warn Chinese aircraft, as did missile defense systems.

In its daily report on Chinese military activities, the ministry said nine Chinese fighter jets and a drone crossed the halfline within 9 hours to 24 a.m. local time (20:00 GMT on Friday).

Taiwan sent planes to warn Chinese planes, the ministry said, while missile systems were monitoring them.

Taiwan's defence ministry accuses China of actions deliberately inciting tension and undermining peace and stability.

Beijing has threatened an unspecified retaliation if Taiwanese President Tsai Ing-wen, who is currently on a trip to the Americas, meets U.S. House of Representatives Speaker Kevin McCarthy.

Tsai is expected to meet him in Los Angeles on her way back to Taipei this month from Central America.

China held war games around Taiwan in August, after then-US House Speaker Nancy Pelosi visited Taipei, and Beijing continued military activities near Taiwan, albeit on a limited scale.

A senior Taiwanese official familiar with the island's security plans told Reuters last week that China was unlikely to repeat such a major drill, but that all preparations had been made in anticipation of any "irrational" Chinese reaction.

Separately, nine Chinese aircraft crossed the midline on Friday and carried out combat readiness patrols, which Taiwan's defence ministry said were "deliberate actions that create tension" and undermine peace and stability.