International treaties offer an additional choice for China to hunt corrupt officials that flee overseas. For example, China hasn't signed a bilateral extradition treaty with Canada but both are members of the United Nations Convention Against Corruption, so it can resort to specific articles to net corruption suspects. The G20 cooperation on anti-graft marks further progress in this direction.

Huang Feng, professor of international criminal law at Beijing Normal University, Beijing News, Nov 17

Corruption is an economic problem, because it increases commercial costs, and a political problem because it damages public confidence in government. The World Bank estimates that the cost of global bribery alone is as high as $1 trillion. To promote the prosperity of the world economy and lower the risks, it is necessary to build an environment that allows only legal business activities.