The latest clashes shook an already battered ceasefire deal between Kiev and pro-Moscow rebels, as President Petro Poroshenko held key talks with Russian leader Vladimir Putin in Milan.
"Yesterday the fighters from a special forces battalion were going to a checkpoint near the village of Smile (Lugansk region) but came across an ambush," spokesman Vladyslav Seleznyov told AFP.
He initially said that eleven soldiers were missing but later told AFP that four of them had returned to Ukrainian positions.
The area near Smile, west of rebel hub Lugansk, has been a flashpoint in the conflict this week. A local pro-Kiev governor said Wednesday that more than 100 soldiers were surrounded by a group of rogue rebels who do not answer to the main separatist leadership.
The rogue rebels, Cossacks who are known as the "Donskoy army," do not recognise the truce deal signed on September 5.
Kiev's military also said Friday that three soldiers were killed over the past 24 hours as fighting with pro-Russian separatists engulfed several hotspots in eastern Ukraine, including the airport on the outskirts of rebel bastion Donetsk.
The Donetsk city hall said shelling continued in the afternoon in residential areas, with one civilian reported dead.
Army spokesman Andriy Lysenko said the rebels had attacked the airport three times with mortar guns, tanks and artillery over the past day.
Fighting has reduced the state-of-the-art facility opened for the Euro 2012 football championships to a bullet-ridden carcass as rebels have pelted the terminals from nearby neighbourhoods.
Seven civilians died in a Mariupol suburb on Tuesday after shells exploded close to a funeral procession.
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