United Nations Office on Drugs and Crime (UNODC) Executive Director Yury Fedotov said Wednesday the Conference of the Parties in Vienna beginning October 15 was crucial to combating transnational organized crime.

Fedotov said a problem with tackling organized crime was that, challenged in one country, it would often reappear "fully-formed" in another, Fedotov said.

"If successes are to be durable and long lasting, we need to emphasize a global approach; one that denies transnational crime a home anywhere," he said.

Transnational organized crime is estimated to generate around $870 billion every year, according to the United Nations Information Service (UNIS).

Among all, illicit drug trade generates around $320 billion, with other major organized criminal activities including human and wildlife trafficking, illegal logging, and cybercrime also generating figures running into the billions of dollars.

The Conference in Vienna is expected to be attended by around 800 people including Austrian Minister for Justice Beatrix Karl, and Mexican Secretary of the Interior Alejando Poire.