Government troops in eastern Ukraine have launched a dawn attack on separatist rebels in the port of Mariupol, with heavy fighting reported.
Interior Minister Arseny Avakov said the security forces were successfully bringing separatist strongholds in the city "under control".
Five pro-Russian rebels were reported killed and at least four government soldiers injured in the city.
Rebels elsewhere in the region have confirmed they now have three tanks.
The appearance of the tanks, filmed in various towns in the Donetsk region, sparked a row between Kiev and Moscow, with Ukrainian President Petro Poroshenko protesting to his Russian counterpart, Vladimir Putin. Russia denied Ukrainian allegations that the tanks had entered Ukraine from its territory.
Hundreds of combatants and civilians have been killed since pro-Russian separatists in the Donetsk and neighbouring Luhansk regions declared independence after holding referendums last month which were deemed illegal by the government in Kiev.
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