Donald Trump's special envoy said Russia had agreed to allow the US and Europe to give Ukraine "robust" security guarantees as part of a potential peace deal.
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Steve Witkoff told CNN it was agreed at the Alaska summit that the US and Europe could "effectively offer Article 5-like language to cover a security guarantee", referring to Nato's principle that an attack on one member is an attack on all.
Putin has long opposed Ukraine joining Nato, and Witkoff said the arrangement could be an alternative if the Ukrainians "can live with it".
Ukraine's President Volodymyr Zelensky described the US's security guarantee offer as "historic" ahead of talks with Trump and European leaders on Monday.