Craig Levein has been confirmed as the new Scotland coach after the SFA agreed terms with Dundee United.
Levein has signed a two-year deal to take control of the national team.
"While it is a great honour to be asked to manage your country, it was a very difficult decision to leave Dundee United," said the 45-year-old.
"I have, and will continue to have, a great affection and respect for the club and its supporters, who have given me such strong support from the day I arrived.
"I also leave behind a great bunch of players and a strong backroom staff and I know the club is in good hands.
"It is a great wrench to leave the club and I will keep many great and poignant memories of my time at Tannadice.
"It has been a pleasure to work with Stephen Thompson and his late father Eddie and I'd like to take this opportunity to thank them, the directors and all of the staff at the club for their support over the last three years.
"I wish them and Dundee United well for the future."