'Many dead' in Ukraine offensive in Sloviansk - Turchynov

Fergal Keane reports from outside Sloviansk where violent clashes have claimed several lives

Many pro-Russia rebels have been killed, injured and arrested in the Ukrainian government offensive in the eastern city of Sloviansk, acting President Oleksandr Turchynov has said.

In a statement, he said the operation in the rebel-held city was not going as quickly as hoped.

Separatists shot down two Ukrainian army helicopters, killing a pilot and a serviceman. Seven have been injured.

The UN Security Council met in emergency session at Russia's request.

Moscow's ambassador warned of "catastrophic consequences" if Kiev's military operation in eastern Ukraine continued, while the US called it "proportionate and reasonable".

Moscow came in for an onslaught of criticism from other nations which claimed it had sponsored the rebels and armed them with weapons capable of bringing down two Ukrainian helicopters, says the BBC's Nick Bryant in New York.

At the scene

I am standing at a bridge where there is a stand-off going on between the Ukrainian armed forces and a large group of pro-Russian locals.

I can see about 300 people waving Russian flags, singing and chanting - as if they are daring the military to go closer.

A heavy downpour of rain and a lightning storm have pushed people back a little bit. But it is a very tense situation here.

At the moment the troops are standing around in the field and the protesters are keeping to their part of the bridge. It is difficult tell in which direction this will go. The atmosphere in a place like this can change very quickly.

In his statement earlier, acting President Turchynov said the fight against rebel forces was "greatly complicated" by the fact that the conflict in eastern Ukraine was taking place in population centres.

He accused pro-Russian forces of hiding behind civilians and hostages.

All pro-Russian checkpoints around the city had been captured, Mr Turchynov added, though separatists have spoken of several still being under their control.

The self-proclaimed pro-Russia mayor of Sloviansk, Vyacheslav Ponomaryov, described the city has being "densely encircled".

"The shooting continues, then goes quiet, shots are heard on the streets, helicopters fly over the town now and again," he told Russia's Interfax news agency.

Sloviansk, eastern Ukraine

To the south, at least three people have been killed in clashes in the coastal city of Odessa between pro-Russian protesters and supporters of a unified Ukraine.

Gunfire was heard and stones and petrol bombs were thrown. A trade union building is on fire, with reports that pro-Russia activists barricaded themselves inside after their protest camp was burned down.

Footage shows people trying to escape from the building in Odessa

The West continues to accuse Moscow of provoking the unrest in eastern Ukraine, something Russia denies.

US President Barack Obama, at a meeting with German Chancellor Angela Merkel at the White House, warned of further sanctions against Russia if it did not "change course".

He said the idea that the unrest was caused by a "spontaneous uprising" was "belied" by the militants' use of missiles.

On the seven Organization for Security and Co-operation in Europe observers detained in Sloviansk by pro-Russian activists, Mr Obama said both leaders were "united in their outrage" about their treatment.

Elsewhere in eastern Ukraine:

  • Unknown attackers seized a local railway control centre near Donetsk, disrupting train movement
  • Pro-Russian rebels left the city council office and TV centre in the eastern Luhansk region
Map showing eastern Ukraine
Ukrainian troops confront a pro-Russia sympathiser outside Sloviansk, eastern Ukraine, 2 May 2014 Ukrainian troops have been seizing pro-Russia checkpoints round Sloviansk
A Ukrainian military helicopter flies near Sloviansk. Photo: 2 May 2014 Military helicopters were involved in the "anti-terror" operations
Pro-Russia militant with a catapult fires objects at pro-Kiev protesters in Odessa, 2 May 2014 Several people have been killed in clashes between pro-Russian and pro-Kiev protesters in Odessa

Eastern Ukraine has a large Russian-speaking population. It was a stronghold for President Viktor Yanukovych before he was overthrown by pro-Western protesters in February.

Russia then annexed the Crimean peninsula - part of Ukraine but with a Russian-speaking majority - in a move that provoked international outrage.

The crisis has plunged East-West relations to their lowest point since the Cold War ended in the early 1990s.

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