Serb ultranationalist Vojislav Seselj has arrived in Belgrade after U.N. war crimes judges approved his provisional release on humanitarian grounds because of his ailing health.

Hundreds of his supporters cheered at Belgrade airport as Seselj returned on a commercial flight from Amsterdam on Wednesday.

Judges at the U.N. War Crimes Tribunal for the Former Yugoslavia in the Netherlands released Seselj to seek medical treatment in Serbia on condition that he does not interfere with victims or witnesses and that he returns to the tribunal if summoned by judges.

Serbian doctors who visited Seselj recently say he is suffering from cancer.

Seselj has been in custody since surrendering to the tribunal in 2003. He pleaded not guilty to war crimes charges related to the Balkan wars in the 1990s.