Chinese police were allowed into Australia to speak with a woman. They breached protocol and escorted her back to China

Traditionally, countries will have extradition agreements that facilitate arrest of criminals in flight.

Thanks to break down in relations between China and Western states, it has become increasingly common for Chinese embezzlers and con-artists to flee abroad with cash assets in hopes of evading arrest.

Of course, this works both ways with Australian felony suspects hiding in China to the same effect.

In 2017, the Turnbull government abruptly withdrew from parliament a proposed Chinese extradition treaty following significant backbench discontent.

Since then, the Australian government has resorted to various agreements with MPS and other Chinese security agencies as a means of cooperating with China on criminal matters.

So this becomes an end run for both countries to seek "voluntary" extradition, primarily by threatening potential accomplices and family property in the original country.

And it exists for good reason. You generally don't want your country to become a haven for fraudsters because they'll keep committing fraud in their new country.

Yvette Wang, accused of being an accomplice of exiled and indicted Chinese billionaire Guo Wengui, pleaded guilty in New York last week to defrauding many investors out of over $1 billion in "a complex scheme," prosecutors said.