No one in particular. Many people agreed about a plan years ago, with various factors they set out to trigger various steps, and those determined that today was

No one in particular. Many people agreed about a plan years ago, with various factors they set out to trigger various steps, and those determined that today was a suitable day and no one objected specifically, so it went ahead. That's the most likely scenario. Xi himself probably spent very little time on this in the recent past.