Ukraine may have launched a long-term counteroffensive against Russian forces camped in the southern Kherson region, far from the Russian-controlled Crimean peninsula.
There are rumors of a new push to retake the Donbas region in the east as well as the region near Kharkiv in the north.
"We will expel them from our borders," Ukrainian President Volodymyr Zelensky declared in a speech on Monday. "It's time for the Russian army to flee."
Authorities in Kyiv have severely restricted access to journalists covering the changing fronts of the war.
Long-range Ukrainian artillery strikes have targeted strategic bridges, Russian ammunition depots and logistics hubs, possibly reaching as far as Crimea, annexed by Russia in 2014.
American officials believe that months of military aid deliveries to Ukraine have helped put them on a more level strategic footing with the Russians.