What can you do about this? Pretty much nothing. China is the second largest economy in the world, and has the second most powerful military. In addition, what they view as the integrity of China is one of their biggest priorities. In addition, they have always viewed British control of Hong Kong as a national humiliation and are bent on erasing all traces of that memory.
The way it stands right now, China can inflict a lot more pain, and is likely willing to endure more pain that the rest of the world is likely willing to inflict on China because of their behavior in Hong Kong.
Basically, the fate of Hong Kong was decided in 1985 with the Sino-British Joint Declaration which ceded Hong Kong back to China in 1997. If Great Britain, and the rest of the world did not have the will to resist China taking control of Hong Kong in 1985 and 1997 when China was a lot less powerful, a lot less developed, and a lot more susceptible to pressure from the rest of the world, there is no hope for now.
The way it stands right now, China can inflict a lot more pain, and is likely willing to endure more pain that the rest of the world is likely willing to inflict on China because of their behavior in Hong Kong.
Basically, the fate of Hong Kong was decided in 1985 with the Sino-British Joint Declaration which ceded Hong Kong back to China in 1997. If Great Britain, and the rest of the world did not have the will to resist China taking control of Hong Kong in 1985 and 1997 when China was a lot less powerful, a lot less developed, and a lot more susceptible to pressure from the rest of the world, there is no hope for now.