Taiwan's defence ministry said the nine Chinese aircraft crossed at points in the north, centre and south of the strait's median line, which used to serve as an unofficial buffer between the two sides.

Source: https://gazette.com/news/us-world/china-stages-combat-patrols-after-warning-taiwan-about-u-s-speaker-meeting/article_e7a9a4a9-b6c3-5d19-94d6-e6a8c5a3b1a7.html