Slobodan Milosevic, architect of the Balkan conflicts that produced Europe’s worst atrocities since World War Two, is to appear before a United Nations judge on Tuesday to enter a plea on war crimes charges.

The UN war crimes court prosecutor says Slobodan Milosevic will be indicted for war crimes committed in 1990s wars in Bosnia and Croatia as well as against Kosovo Albanians.

Slobodan Milosevic arrived in The Hague early today, hours after Serb authorities handed the former Yugoslav president over to the UN war crimes tribunal to face charges of ‘‘crimes against humanity.’’