US defence secretary Pete Hesgeth says it is "unrealistic" to expect Ukraine to return to its pre-2014 borders when Russia first took control of Crimea.
He also downplayed suggestions of Ukraine joining Nato and ruled out deploying US troops to Ukraine under any future security arrangements.
Ukraine has repeatedly called for Nato membership and has rejected ceding territory as part of any peace deal.
Russia currently controls around a fifth of Ukraine’s territory, mainly in the east and south.
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