The virus originated from chinese horseshoe bats. It can't just randomly teleport to some other country on the other side of the world to start an outbreak, before existing in human population of China.
Unless these bats are perfectly clean and disease free, after millions of years of evolution. And somehow, only the bats in China, can carry a novel coronavirus?
I’m just pointing out that bats exist worldwide. And they can infect other farm animals. This is not a unique situation to only China.