The Russian army is moving at a “glacial pace” and struggling to gain ground more than three years after its invasion — but it still could take years and major losses for Ukraine to reclaim all the territory Moscow has taken since 1991 , according to military analysts.

The Ukraine war saw a major shift on Tuesday after President Trump claimed for the first time that Kyiv can push back Russia’s forces and liberate 20% of the country currently occupied by the Kremlin.

Such a feat, however, would come at a high cost that would force Ukraine’s military to ramp up enlistment, weapons production and develop a fully fledged air force and navy, Seth Jones, of the Center for Strategic and International Studies (CSIS) think tank, told The Post.

“It will be hard, but not impossible to take bac

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