Kimi Raikkonen will leave Ferrari at the end of the 2018 F1 season and join Sauber. The Finn is in his second spell with Ferrari, having won the 2007 title in his first. Raikkonen leaves behind team-mate Sebastian Vettel, who signed a new deal last year. Raikkonen will swap seats with Charles Leclerc, who will join Ferrari from Sauber.