According to Warrior Maven:

There’s been a show of force in the skies around Taiwan in recent weeks as China underscores its unhappiness with those resisting the island’s reunification with the mainland. According to Taiwan’s defense ministry, there were consecutive double-digit numbers of People Liberation Army aircraft operating around the island in the past week. On Monday, Taiwan said that 23 PLA aircraft and seven PLA ships were detected over the past day.
If China makes a move, it is most likely to occur before November. They most certainly don’t want competency in the White House when they try to take over Taiwan.