Pro-Russian rebels in eastern Ukraine have shot down a military helicopter near Sloviansk, killing 14 people, the country's outgoing president says.
Olexander Turchynov said the rebels used a Russian-made anti-aircraft system, and an army general was among the dead.
The town of Sloviansk has seen fierce fighting between separatists and government forces in recent weeks.
President-elect Petro Poroshenko has vowed to tackle "bandits" in the east.
Meanwhile, Russia has reiterated calls for Ukraine to stop its military campaign against the pro-Moscow rebels and "start a real national dialogue".
In a statement, the Russian foreign ministry also urged the United States and European Union "to use all their influence on Kiev to stop Ukraine's slide into national catastrophe".
The helicopter had just taken off after transporting soldiers to a Ukrainian base
The helicopter arrived at Karachun [near Sloviansk], to unload and pick up a group of people who were finishing their tour and going on leave. They were shot down after take-off. I had talked to the pilot and also to Gen Kulchytskiy. The pilots were very nice guys - polite, correct, friendly.
Gen Kulchytskiy was very capable and very accessible. A good commander who would fly to the checkpoints where his soldiers were. He would personally bring them food and water. He kept an eye on everything.
The fighting here has become more frequent recently. In the last few days, it broke out even during the daytime. Previously, it happened only at night.
However, the last two days were relatively quiet. The army man checkpoints, preventing the forces of the People's Republic of Donetsk from moving about freely. The mood is good among the soldiers. No desertion or talk about giving up. People are in good fighting spirit.
The BBC's Mark Lowen in the region says Thursday's incident was a major blow to the Ukrainian army as it pursues its offensive against the separatists.
The helicopter was hit during heavy fighting between Sloviansk and Kramatorsk, after it had dropped off troops at a military base.
Black smoke was seen rising from the scene of the crash
President Turchynov said the 14 dead included Maj Gen Serhiy Kulchytskiy, head of combat and special training for Ukraine's National Guard.
It is one of the worst losses of life for government forces in the conflict so far. Last week at least 14 soldiers died in a rebel attack on an army checkpoint near Donetsk, some 130km (80 miles) from Sloviansk.
Earlier this month the separatists shot down two army helicopters, also near Sloviansk, killing a pilot and another serviceman.
Mr Poroshenko, a confectionery magnate, won 54.7% of the vote in last Sunday's presidential election, according to final results announced on Thursday.
After the poll, he called the separatists "terrorists" intent on maintaining a "bandit state". He vowed to tackle them "in hours", not months.
Maj Gen Serhiy Kulchytskiy
- Born on 17 December 1963 in East Germany where his father served with a Soviet military contingent
- Began military career as a marine platoon commander at the Soviet Northern Fleet in Murmansk Region
- Moved to western Ukraine in 1992 and became deputy commander of a National Guard battalion in Ternopil
- Awarded the rank of major-general by President Viktor Yanukovych in August 2013
Missing monitors
The conflict has intensified in recent days. The rebels say they lost up to 100 fighters when they tried to seize Donetsk airport on Monday.
Alexander Borodai, the separatist leader of the self-proclaimed Donetsk People's Republic, said 33 Russian nationals had been among those killed in the airport clashes.
Mr Borodai, himself a Russian citizen, said their bodies had been identified and would be taken to Russia.
More than 30 Russian nationals died during clashes with Ukrainian troops at Donetsk airport on Monday
Rebels have been manning barricades near the airport, where fighting has recently intensified
On the same day, pro-Russia militiamen seized four international monitors in Sloviansk, which has long been the epicentre of heavy fighting.
The four - a Dane, an Estonian, a Turk and a Swiss national - are members of the Organization for Security and Co-operation in Europe (OSCE).
The self-proclaimed mayor of Sloviansk, Vyacheslav Ponomaryov, told Russia's Interfax news agency they were safe and well and could be released soon.
The OSCE has said it does not know the monitors' whereabouts, but Mr Ponomaryov told another Russian news agency they were being held in the village of Makeyevka.
Pro-Russian separatists in the regions of Donetsk and Luhansk declared independence after referendums on 11 May, which were not recognised by Kiev or its Western allies.
The separatists took their cue from a disputed referendum in Crimea, which led to Russia's annexation of the southern peninsula.
Ukraine's deadliest clashes
24 April: Ukraine military kills five rebels in assault on Sloviansk
2 May: More than 40 people killed in burning building after street fighting in Odessa
9 May: 20 pro-Russian activists and Ukrainian security officer killed in Mariupol
13 May: Seven Ukrainian soldiers killed in ambush between Sloviansk and Kramatorsk
22 May: Rebel attack on checkpoint in Volnovakha leaves at least 14 soldiers dead
27 May: At least 40 rebels killed in "anti-terrorist operation" against separatists holding Donetsk airport
29 May: Ukrainian military helicopter shot down near Sloviansk, killing 14
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