Ukraine's counteroffensive against formidable Russian defenses has been grueling and bloody, Ukrainian and American officials acknowledged on Thursday, but they insisted that it was making gains and that any verdict on its success was extremely premature.Last week, Kyiv began a multipronged assault into territory in southeastern Ukraine that Moscow's forces had seized, hunting for weaknesses to exploit in hopes of punching through the deep network of minefields, trenches, bunkers, tank obstacles and artillery that the Russians built.
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