Marko Milosevic and his sister Marija

The fugitive playboy son of Mr Milosevic was in early March reported to be holed up in a Siberian hotel, under the protection of the Russian mafia.

During his father's rule, Marko became infamous for his lavish and thuggish lifestyle, running nightclubs and controlling cigarette smuggling rackets in Serbia. He fled to Russia with his wife, Maria, and infant son just after his father was ousted from power.

Momir Bulatovic and the Montenegrins:

Mr Milosevic's most senior Montenegrin ally, Momir Bulatovic resigned as Yugoslavia's prime minister - though his departure would have come about in any case as part of the formation of a new government.

A former president of Montenegro, Mr Bulatovic was defeated by the anti-Milosevic forces in the Montenegrin presidential race and, as a compensation, he was appointed prime minister by Mr Milosevic.

Mr Bulatovic's previously strongly pro-Milosevic Socialist People's Party of Montenegro is now expected to switch sides to join Mr Kostunica's supporters in a new Yugoslav government.

Vojislav Seselj and the Radicals:

Vojislav Seselj: Could switch to opposition

Mr Seselj was the Serbian Deputy Prime Minister and leader of the ultra-nationalist Radical Party, which joined Mr Milosevic's coalition government in 1988, helping to steer it towards confrontation in Kosovo.

Recently there have been increasing signs of strain between the two former coalition partners; and the radicals had their own candidate running in the presidential election.

Just after the presidential elections Mr Seselj distanced himself from Mr Milosevic by agreeing with the opposition's claim that their candidate, Vojislav Kostunica won the elections.

Mr Seselj has sided with the new president on most matters since Mr Milosevic's fall. He is said to have cordial relations with Mr Kostunica.

The Karic brothers and the business oligarchy:

General Dragoljub Ojdanic: Indicted for war crimes

Bogoljub Karic and his brothers have emerged in the past decade as among the most successful operators in an economic environment overshadowed by war and sanctions.

The Karic brothers and other wealthy executives formed a symbiotic relationship with Mr Milosevic's regime in which political favours and business operating licences were exchanged for cash and where ministers often had senior business appointments.

Bogoljub Karic has been in Moscow recently, giving rise to unconfirmed reports that the Karic family may be transferring their operations to Russia.

General Dragoljub Ojdanic and the army:

Elevated by Mr Milosevic to the post of Defence Minister, General Ojdanic is among those indicted for war crimes.

He has not been seen in public since the Belgrade uprising. However, his successor as chief-of-staff, General Nebojsa Pavkovic, played a key role in forcing Mr Milosevic - at gunpoint - to concede defeat to Mr Kostunica.

Despite a purge of the Serbian army in January this year, General Pavkovic has held onto his post, despite key figures in Mr Kostunica's camp demanding the general's replacement because of his close association to Mr Milosevic.

Vlajko Stojiljkovic and the police:

Mr Stojiljkovic was Serbia's former minister of the interior and a senior SPS figure. He is also charged by The Hague with war crimes.

Previously he presided over a police force that has had resources lavished on it during the Milosevic era.

Serbia's Prime Minister, Mirko Marjanovic, has now taken over the Interior Minister's functions - but many sections of the police appear to owe their loyalty now to the new regime under President Kostunica.

Another key figure is Rade Markovic, the head of the security police, who is a close friend of Mr and Mrs Milosevic.

He escorted Marko Milosevic and other figures in the old establishment to Belgrade airport to oversee their safe departure after Mr Milosevic was ousted.

In February, Mr Markovic was arrested by the Serbian authorities. He was accused by various human rights groups and Milosevic opponents of being behind a series of political killings.

The arrest of Mr Markovic was seen as adding to the momentum for an arrest and prosecution of Mr Milosevic.