Ukraine is gaining ground in its counter offensive, NATO chief says
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Ukraine has started a counteroffensive in June to reclaim territory seized by Russia.
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NATO Secretary-General says Ukraine is slowly gaining ground, despite Russian fortifications and minefields.
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Ukraine has struggled to break through entrenched Russian lines.
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Ukrainian forces have pushed past Russia's first line of defense but face more lines.
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NATO chief praises Ukraine's military achievements against the formerly second strongest army.