LONDON -- Ukrainian President Volodymyr Zelenskyy claimed on Tuesday that Russian President Vladimir Putin is preparing for "new offensive operations" despite Friday's looming peace summit in Alaska -- and as Russian forces appear to have scored significant frontline success in eastern Ukraine.

Fierce frontline combat and long-range drone and missile strikes are ongoing as the U.S. and Russia prepare for Friday's meeting. Ukrainian representatives are not expected to attend, though a source in Zelenskyy's office told ABC News on Monday that "everything is very fluid."

Zelenskyy and his officials have gone on a diplomatic offensive ahead of the meeting, seeking to shore up foreign support behind Ukraine's key demands in any peace deal.

On Monday, Zelenskyy suggested that Putin is not

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