2 May 2014
Last updated at 14:44 ET
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.
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.
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.
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:
Ukrainian troops have been seizing pro-Russia checkpoints round Sloviansk
Military helicopters were involved in the "anti-terror" operations
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.
'Many dead' in Ukraine offensive in Sloviansk - Turchynov
To see videos:
http://www.bbc.com/news/world-europe-27259614
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.
Continue reading the main story
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.
At the scene
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.
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
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
Ukrainian troops have been seizing pro-Russia checkpoints round Sloviansk
Military helicopters were involved in the "anti-terror" operations
Several people have been killed in clashes between pro-Russian and pro-Kiev protesters in Odessa
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.
Ukraine crisis
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Is Moscow orchestrating eastern Ukraine's little green men?
Behind the masks
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Oligarch speaks out
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Wild east
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Europe and Russian gas
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Sloviansk angst
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Sanctions targets
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Screw tightens
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BBC reports
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West's options
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Putin's threats
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Russian media
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Muddying the waters
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What's happening where?
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Russia's modernised forces
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