European leaders also wanted to secure US support ... and on the other hand to avoid unnecessary objections from Putin," the expert says. In general, this approach is workable and does not contradict NATO's charter. There have been cases in history ...

Special U.S. envoy Steve Witkoff says Russian leader Vladimir Putin agreed to allow the U.S. and Europe to offer Ukraine a security guarantee resembling NATO's collective defense mandate.

Putin seeks "a multilateral system of commitments that includes not only the West but also Russia itself," one expert told Newsweek.

United States and NATO officials were set to meet Wednesday to discuss security guarantees for Ukraine as the White House worked to arrange a summit between Volodymyr Zelenskyy and Russia's Vladimir Putin.

The protections that the US and Europe would be able to provide to Ukraine are similar to NATO's collective defense mandate.