Discard political bias and ideological differences to sign extradition treaties with China and help bring criminals to justice, Western nations have been urged.

"We are trying hard to negotiate with developed countries to conclude bilateral extradition treaties," Duan Jielong, director general of the Department of Treaty and Law of Ministry for Foreign Affairs, told China Daily.

He admitted that some countries - which have abolished the death penalty and do not allow extradition to nations where it is applied, are hesitant about signing pacts with China, where the penalty has been a longstanding integral part of the criminal justice system.