AFP - Bosnian Serb wartime leader Radovan Karadzic has written to the UN Security Council asking it to "honour" an immunity agreement he claims was made on its behalf, a court document stated Friday.

"Dr Radovan Karadzic ... has requested the United Nations Security Council to enact a resolution which honours the agreement made on its behalf by Richard Holbrooke," states a notice filed with the International Criminal Tribunal for the former Yugoslavia (ICTY) and made available to the media.

The court on Tuesday dismissed an appeal by Karadzic over his claim that US diplomat Holbrooke promised him immunity from prosecution in 1996 in exchange for withdrawing from public life.

Judges ruled that only a resolution of the Security Council, which created the ICTY, could limit its jurisdiction.

Karadzic's letter, dated Friday and addressed to the current UN Security Council president Le Luong Minh, repeats his claim that Holbrooke -- the architect of the Dayton peace accords that ended the Bosnian war -- had promised him immunity on the council's behalf.

"The appeals chamber of the ICTY ruled that the agreement with Mr Holbrooke was not effective without a resolution from the Security Council," states the document.

"Therefore, I would appreciate it if you would enact the required resolution."

Karadzic asserts that he kept his part of the "agreement" by resigning all his positions and withdrawing from public life.

"Of course, it was never my responsibility to obtain such a resolution (from the UNSC), and Mr Holbrooke neglected to do so."

Holbrooke, now President Barack Obama's special envoy to Pakistan and Afghanistan, has repeatedly denied the existence of an agreement with Karadzic.

Karadzic, 64, was arrested in Belgrade in July 2008 after 13 years on the run.

He faces 11 charges, including for his role in the 44-month siege of Sarajevo that left 10,000 people dead and the July 1995 massacre of around 8,000 Muslim men and boys in Srebrenica.