Government forces have taken a TV tower in the suburbs and rebels were pulling back deeper into the city, the Russian Interfax news agency said.Heavy gunfire could be heard, apparently closer to the centre than in recent days, a Reuters reporter said.However, a number of Ukrainian troops have been killed in the fighting, the country's interior minister said.Arsen Avakov could not give the exact death toll, but said up to eight Ukrainian troops had been wounded in an ambush.Four ambulances were seen near the area and at least two separatist armoured vehicles and several rebels were seen in retreat, Reuters reported.Fears of an impending offensive by Ukrainian forces on the pro-Russian stronghold had been growing overnight, sources inside the city said earlier.Ukraine's army cut off the main road into the city on Sunday.The move came days after rebels shot down two Ukrainian helicopters on the outskirts of Sloviansk, one of a dozen or more east Ukrainian cities where pro-Russian separatists have seized official buildings.Ukrainian troops are currently carrying out what the Kiev government calls "anti-terror" operations in the east to wrest back control of these areas.Speaking two days after dozens were killed in violence in the Ukrainian port city of Odessa, Ukraine's Prime Minister Arseniy Yatsenyuk accused Russia of executing a plan "to destroy Ukraine and its statehood.""Russia's aim was to repeat in Odessa what is happening in the east of the country," he said, insisting Kiev had not lost control of the region.The clashes on Friday left more than 40 dead, mostly pro-Russian separatists killed in a building fire.Russia warned on Monday that failure to halt the escalating unrest would threaten peace across Europe.Moscow called on Ukraine and the international community to step up "joint efforts" to end "racism, xenophobia, ethnic intolerance, (and) the glorification of the Nazis" - a reference to extremists Russia claims are committing "mass" rights violations in Ukraine."The alternative is fraught with such destructive consequences for Europe's peace, stability and democratic development that it is absolutely necessary to prevent it," the Russian foreign ministry said in a statement.Ukraine's President Viktor Yanukovych 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.Separatist actions subsequently spread to eastern Ukraine, where Moscow is accused of backing pro-Russians who have seized official buildings in a dozen or more cities.Despite the latest violence, the country plans to hold a presidential election on 25 May.(BBC)Bakudaily.az