Russian forces attacked by Ukraine army in the southern Zaporizhzhia region
They say Ukrainian troops - backed by tanks, artillery and drones - are trying to advance south of the town of Orikhiv for the second night running.
A senior Ukrainian defence official said the enemy was in "active defence".
Several military experts have said the focus of Ukraine's long-awaited counter-offensive will be Zaporizhzhia.
They argue Kyiv is trying to regain access to the Sea of Azov, splitting the occupying Russian forces in the region into two separate groupings.
That would not only weaken Russia's combat capability but also eliminate a land bridge to Crimea, the southern peninsula illegally annexed by Russia in 2014.
Ukraine has been planning a counter-offensive for months, but it has wanted as long as possible to train troops and to receive advanced military equipment from Western allies.
The government is deliberately saying little about its plans, but its forces are now probing Russian positions at several points along the front line, looking for signs of weakness.
Meanwhile Russian attacks on Ukraine continue. Overnight it launched fresh cruise missile and drone strikes, with falling debris killing at least one person in Zhytomyr to the west of the capital Kyiv.
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