Ukraine says it has recaptured ground in Bakhmut, a rare advance after months of grinding Russian gains in the eastern city.
Deputy Defence Minister Hanna Malyar said Ukrainian forces advanced two kilometres (1.2 miles) in a week.
The claims signal a momentum shift in Bakhmut - but more widely, there is no clear evidence of the much-anticipated Ukrainian counter-offensive.
Russia has denied reports of Ukrainian gains, after claims from both sides.
"The individual declarations on Telegram about a 'breakthrough' on several points on the frontline do not correspond to reality," Russia's defence ministry said.
"The general situation in the special military operation zone is under control," it added, using Russia's term for the invasion.
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