State Department spokesperson Ned Price was repeatedly asked at a news briefing whether Washington would support Finland's possible accession without Sweden, but declined to comment on what he called a "hypothetical" and not a "live question right now."

"This has always been a discussion about Finland and Sweden... (about) moving from an alliance of 28 to an alliance of 30. That's what we want to see happen," Price said, adding that Finland joining NATO separately "is just a question that we're not entertaining."

Turkey's president said Sweden should not expect his country's support after a protest near the Turkish Embassy in Stockholm at the weekend, which included the burning of a copy of the Koran.

(Reporting by Daphne Psaledakis, Humeyra Pamuk and Simon Lewis; Editing by Sandra Maler)