If you have the resources and the time to invest in a long game, scorched earth strategy is likely going to be more effective.
It's called being the new superpower on the block. Welcome to the party of relentless, global, 24/7 criticism, China. It's going to get dramatically worse with each passing year and every action taken (no matter what that is).
If they're already violently annexing territory 4x the size of Texas from half a dozen neighboring nations, imagine what they'll be doing with a $20 trillion economy and $500+ billion in military spending in about a decade. Who's going to restrain their behavior then? My guess is: nobody.
It is very well possible that the downfall of the Chinese regime will come from the interior. The regime depends on economic growth like an addict on heroin - they need to feed 1.3B people, of which many are transitioning from poverty to middle-class level.
And much of the Western world is nearing saturation with Chinese products (and in addition, the Western economies aren't growing that much as before themselves!) - that explains the Chinese investments across Africa. They're on quite a gamble at the moment... either a modernized Africa will be the new target market so that the Chinese economy can grow or they're screwed. The question is: will Africa get up to speed before the Chinese economy collapses from a lack of growth?
Also, as for violently annexing territory, they are mild-mannered compared to pretty much every other 'young superpower'. It's worth putting this in perspective with the historical behavior of European superpowers as well as the USA and USSR.