"In the Donbas region we would still assess that the Ukrainians are putting up a very stiff resistance and that the Russians have not made the progress that we believe they expected to make by this point," Kirby said.
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"That's not to say they haven't made any progress."
Earlier the head of the Ukrainian army, Lieutenant General Valeriy Zaluzhny, said that Ukraine's defense forces had launched a counteroffensive in the areas of Kharkiv and Izyum.
According to Ukraine's General Staff, Russia has lost about 24,700 of its soldiers since the beginning of its full-scale invasion of Ukraine.