Kylie Moore-Gilbert, Julian Assange and Cheng Lei (Images: AAP/Reuters/Supplied)

The Australian government often stresses quiet diplomacy is the best tactic to get detained citizens out of international prisons -- but in many cases, it simply has not worked.

Crikey takes a look at Australia's political prisoners locked up abroad.

Chau Van Kham

Detained: Vietnam.
Charge: Terrorism.