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Ukraine crisis: Sloviansk rebels down army helicopters Ukraine crisis: Sloviansk rebels down army helicopters
(35 minutes later)
Pro-Russian rebels have shot down two of Ukraine's army helicopters during an "anti-terror" operation in the eastern city of Sloviansk, Kiev has said.Pro-Russian rebels have shot down two of Ukraine's army helicopters during an "anti-terror" operation in the eastern city of Sloviansk, Kiev has said.
It said a pilot and serviceman had been killed, four suspected separatists held and 10 rebel checkpoints seized.It said a pilot and serviceman had been killed, four suspected separatists held and 10 rebel checkpoints seized.
Half of the city was later declared "under control" of the Ukrainian units.Half of the city was later declared "under control" of the Ukrainian units.
There has been no independent confirmation of the claim. Separatists at three checkpoints earlier told the BBC they were still in control there.There has been no independent confirmation of the claim. Separatists at three checkpoints earlier told the BBC they were still in control there.
Russia said the use of the army by Kiev against its own people was "leading Ukraine to catastrophe".Russia said the use of the army by Kiev against its own people was "leading Ukraine to catastrophe".
Describing the military operation as "punitive", the Russian foreign ministry also urged Western powers to give up their "destructive" policy on Ukraine.Describing the military operation as "punitive", the Russian foreign ministry also urged Western powers to give up their "destructive" policy on Ukraine.
Sloviansk is a stronghold for pro-Russian separatists who are exerting increasing control in the region.Sloviansk is a stronghold for pro-Russian separatists who are exerting increasing control in the region.
The BBC's Fergal Keane, at a bridge outside Sloviansk where there is a stand-off between Ukrainian troops and pro-Russian locals, describes the atmosphere as tense and unpredictable.
In other developments:In other developments:
'Full combat alert''Full combat alert'
Ukraine's anti-terror centre said in a statement that "half of the city" was under control of its units at 12:00 local time (10:00 GMT). Ukraine's anti-terror centre said in a statement that "half of the city" of Sloviansk was under control of its units at 12:00 local time (10:00 GMT).
It said pro-Russian gunmen were using snipers and also mobile units dressed in riot police uniforms.It said pro-Russian gunmen were using snipers and also mobile units dressed in riot police uniforms.
Meanwhile, the commander of Ukraine's National Guard said his units "practically cleared Sloviansk from terrorists".Meanwhile, the commander of Ukraine's National Guard said his units "practically cleared Sloviansk from terrorists".
Earlier, Interior Minister Arsen Avakov said the "active phase" of the operation in the Sloviansk-Kramatorsk region began at 04:30 local time.Earlier, Interior Minister Arsen Avakov said the "active phase" of the operation in the Sloviansk-Kramatorsk region began at 04:30 local time.
"A real battle with professional mercenaries is going on," Mr Avakov said, adding that the separatists were using the tactics of hiding behind civilians in residential buildings."A real battle with professional mercenaries is going on," Mr Avakov said, adding that the separatists were using the tactics of hiding behind civilians in residential buildings.
Russia's state-run Rossiya 24 TV channel said the city was being "stormed".Russia's state-run Rossiya 24 TV channel said the city was being "stormed".
It quoted Sloviansk's rebel commander Igor Strelkov as saying that the city was completely sealed off.It quoted Sloviansk's rebel commander Igor Strelkov as saying that the city was completely sealed off.
The fighting appeared to be concentrating on the periphery of the city, says the BBC's Sarah Rainsford, who is in the regional capital Donetsk.The fighting appeared to be concentrating on the periphery of the city, says the BBC's Sarah Rainsford, who is in the regional capital Donetsk.
In a video posted on YouTube, Sloviansk's self-declared mayor Vyacheslav Ponomaryov said "our city is under attack".In a video posted on YouTube, Sloviansk's self-declared mayor Vyacheslav Ponomaryov said "our city is under attack".
He appealed to children, women and the elderly not to leave their homes.He appealed to children, women and the elderly not to leave their homes.
Local residents were later quoted as saying that the situation in the city had calmed down but remained tense.Local residents were later quoted as saying that the situation in the city had calmed down but remained tense.
Monitors heldMonitors held
Ukraine's acting president has said his forces are "helpless" in some parts of the east, and the country is now on full combat alert amid fears that Russian troops could invade.Ukraine's acting president has said his forces are "helpless" in some parts of the east, and the country is now on full combat alert amid fears that Russian troops could invade.
Some 40,000 Russian troops are stationed near the Ukrainian border.Some 40,000 Russian troops are stationed near the Ukrainian border.
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.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.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.The crisis has plunged East-West relations to their lowest point since the Cold War ended in the early 1990s.
On Thursday, German Chancellor Angela Merkel asked Russia in a phone call to President Putin to help free foreign military monitors seized by rebels in Sloviansk last week.
For his part, Mr Putin reiterated his call for Kiev to withdraw troops from the south-east to open the way for a national dialogue.
Are you in Sloviansk? Do you have any information to share? Send us your comments. You can email us at haveyoursay@bbc.co.uk using the subject line 'Sloviansk'.Are you in Sloviansk? Do you have any information to share? Send us your comments. You can email us at haveyoursay@bbc.co.uk using the subject line 'Sloviansk'.
Send your pictures and videos to yourpics@bbc.co.uk or text them to 61124 (UK) or +44 7624 800 100 (International). If you have a large file you can upload here.Send your pictures and videos to yourpics@bbc.co.uk or text them to 61124 (UK) or +44 7624 800 100 (International). If you have a large file you can upload here.
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