Ukraine to rejig war strategy after leak of classified US docs

US officials are trying to find the source of a leak of classified documents detailing a wide array of topics from Ukraine's air defences to Israel's Mossad spy agency

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Ukraine has been forced to amend some of its military plans ahead of a much-vaunted counter-offensive due to a leak of classified US documents, CNN reported on Monday citing a source close to Ukrainian President Volodymyr Zelensky.

Ukrainian officials told Reuters on Friday the allegedly leaked documents contained fictitious information and looked like a Russian disinformation campaign.

Asked about the CNN report, presidential aide Mykhailo Podolyak said Ukraine's strategic plans remained unchanged but that more specific tactical plans were always subject to change.

"There are strategic tasks they are unchangeable," he told Reuters. "But operational and tactical scenarios are constantly refined, based on an assessment of the situation on the battlefield, resource provision, intelligence data on the enemy's resources, etc." he said. "Right now its impossible to reassess plans, because they are only being worked out (now)," he added.