Military analysts say the Kremlin’s forces may be probing Ukrainian defences for weak points or could be making a feint while preparing for a main thrust through southern Ukraine.
Russian forces continue to bombard Ukrainian positions at several locations in the Donetsk region.
Ukraine's President Volodymyr Zelenskyy said there are reports circulating that Russia's military is plotting a symbolic blitz close to the one-year anniversary of the invasion.
Kyiv says its units are repelling the attacks in Bakhmut, Soledar and Vuhledar, and are preparing themselves for further escalation.
Watch Sasha Vakulina's report in the video player above