In an apparent rebuke of the rhetoric coming out of the Trump administration, Frostadóttir said she hoped to "get a clearer picture" of the White House's stance "sooner rather than later," adding: "It's also difficult for foreign leaders to be reacting constantly to unsure comments.

U.S. Special Presidential Envoy for Ukraine and Russia Keith Kellogg said Saturday that peace plan for the two warring nations could come within days or weeks.

The United States is requesting detailed proposals from European countries on how they plan to support Ukraine throughout and following peace negations with Russia.