Honestly the strategy on the Philippines side is pretty obviously to provoke the US into a show of force to "invalidate" China's new law. But to do so, the US would have to send ships into the area permanently to enforce freedom of navigation, as simple exercises and demonstrations will just lead to the same old reaction of China waiting until the US ships are gone before moving back in. I'm sure Chinese strategists have thought through this scenario though and concluded they'd come out ahead even if the US took the bait.