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Nato has launched the first wave of strikes against Serbian military targets, fulfilling weeks of warnings of military action over the Kosovo crisis.
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The many threats against President Milosevic were finally acted on with explosions first heard at about 1900 GMT.
Russia's President Boris Yeltsin has recalled the country's representative at Nato's Brussels headquarters and ordered a halt to all co-operation with the alliance.
The UN's Security Council is due to meet at Russia's request at midnight GMT Wednesday.
BBC Correspondents and news agencies have reported explosions in Serbia and Montenegro including:
Correspondents in the Kosovo capital Pristina report:
In its first reports, the Yugoslav news agency Tanjug say that some family members of government forces have been killed.
The agency also reported that seven Serbian towns had been hit in the first wave of Nato attacks.
The missile strikes are expected to pave the way for huge bombing raids on Serb forces by up to 400 Nato warplanes on standby in the region.
![[ image: width=150]](/olmedia/300000/images/_303043_clinton_kosovo_quote_150.gif)
Nato Secretary-General Javier Solana announced the beginning of the operation after waves of Nato planes took off from the an airbase at Aviano in northeastern Italy at nightfall.
Hours earlier, eight American B-52 bombers, armed with cruise missiles, left from an airbase in England.
Speaking shortly after the announcement of the attacks, President Bill Clinton said the aim of the action was threefold: to demonstrate Nato's opposition to agression, to deter President Slobodan Milosevic from further attacks and to diminish the Serbs' military capability.
![[ image: width=150]](/olmedia/300000/images/_302353_nato_text.gif)
''Kosovo's crisis is now full blown,'' he said. ''If we don't act clearly it will get even worse.
"Only firmness now can prevent greater catastrophe later.''
Military observers say the warplanes will meet a stiffer challenge than air missions over Iraq; western leaders have acknowledged they risk casualties.
Yugoslavia was placed on high alert after the government declared a state of emergency. Military preparations included setting up air-raid shelters and bunkers for civilians.
Thousands of Kosovo Albanians have been fleeing the latest Serb-led offensive, heading south into the former Yugoslav republic of Macedonia.
Defiant Serbs
On Wednesday afternoon, Serb leader Slobodan Milosevic called on his people to be prepared to defend their country "by all means".
![[ image: width=150]](/olmedia/300000/images/_302353_ital_kos_nato_base.gif)
In a nationally televised address he warned them that "at stake is the freedom of the entire country".
"We shall defend the country if it is attacked," he said.
But blaming Yugoslav Government "intransigence", the Nato secretary-general has said Nato's quarrel was not with the Yugoslav people and that the attacks would be aimed at weakening the Yugoslav army and paramilitary police forces.
'New Vietnam warning'
President Boris Yeltsin appealed to world leaders in a national television address on Wednesday to keep Bill Clinton from making what he described as a "terrifying and tragic" mistake of launching air strikes against Serbia.
Its Prime Minister, Yevgeny Primakov has warned that Russia's relations with Washington will be damaged and European stability harmed.
The Russian Defence Minister, Igor Sergeyev, has warned that Nato strikes could produce "a new Vietnam inside Europe".
Clinton: 'We must act now'
(24 Mar 99 | Europe)
Blair: Kosovo strikes under way
(24 Mar 99 | UK Politics)
Yugoslavia on red alert
(24 Mar 99 | Europe)
Kosovo Albanians search for safety
(24 Mar 99 | Europe)
Milosevic's statement: 'Defend the country'
(24 Mar 99 | Monitoring)
How the West justifies action
(24 Mar 99 | Europe)
Analysis: Can the Serbs hit back?
(24 Mar 99 | Kosovo)
Kosovo: Timeline of recent events
(23 Mar 99 | Kosovo)
Analysis: The task facing Nato
(23 Mar 99 | Kosovo)
Profile: Nato's military commander
(23 Mar 99 | Kosovo)
United Nations High Commissioner for Refugees
International Crisis Group
Institute for War and Peace Reporting
Nato
Serbian Ministry of Information
Kosovo Information Centre
OSCE
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