The Hague: Former Bosnian Serb leader Radovan Karadzic is being asked for a second time on Friday to enter a plea at a UN tribunal for charges of war crimes and crimes against humanity in the 1992-95 Bosnian war.

Karadzic refused to enter a plea at his first hearing a month ago and instead challenged the court's legitimacy.

In his latest submission, Karadzic called the tribunal a "bastardized judicial system", saying it was biased towards finding him guilty.

The charges against Karadzic include genocide over the 43-month siege of Sarajevo and the 1995 massacre of 8,000 Muslims at Srebrenica.

Karadzic was arrested in July in Belgrade, where he lived in disguise.

If Karadzic does not enter a plea, a not guilty plea will be entered on his behalf, according to the rules of the International Criminal Tribunal.