If one sets aside the issue of Taiwanese independence and whether China does or does not control the straight of Taiwan (a large thing, sure), nothing about this seems terribly surprising or aggressive on China's part.
The US sent a Navy cruiser through water China claims is theirs. China flew a drone to keep watch. If it had been the other way around, the US would have done the same, no doubt.
It's all games to look and sound very important and powerful.