Brig Gen Oleksiy Gromov said at a briefing that Ukrainian armed forces had advanced up to 30 miles into Russian lines and that "the total amount of territory returned to Ukrainian control in the Kharkiv and Pivdennyi Buh directions stands at over 700 sq km [270 sq miles]".
Gromov said Ukrainian troops had advanced up to 2 miles on the Sloviansk front in the east and recaptured a settlement called Ozerne.
This is the first time Kyiv has disclosed details of its recent counteroffensive since last week, so as not to compromise the operation.
The general singled out the role of Turkish-made Bayraktar drones. "Enemy infantry and motorised artillery units unprotected by air defence systems become easy prey for our Bayraktars, the quantity of which is always increasing, thanks to our volunteers," he said.
A top US general, Mark Milley, described the progress of Ukraine's counteroffensive as "steady" and "deliberate", and pointed in particular to the impact of US-supplied high mobility artillery rocket systems (Himars) in supporting Ukraine's advance.
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