Sweden and Finland will eventually become part of NATO, Spanish Prime Minister Pedro Sanchez said on Tuesday alongside the alliance's Secretary General Jens Stoltenberg hours before a NATO summit was due to open in Madrid.

"We are convinced that, if not now, it will be later, but eventually they will join the Atlantic alliance," Sanchez told reporters. Added Stoltenberg: "We hope to make progress on the accession of Finland and Sweden."

(Reporting by Belen Carreno and Inti Landauro. Writing by Emma Pinedo; Editing by Andrei Khalip)