A Malaysian court sentenced former Prime Minister Najib Razak to serve up to 12 years in prison on Tuesday after finding him guilty of crimes involving the multibillion-dollar looting of the 1MDB state investment fund that brought down his government in a shocking election ouster two years ago.

Najib was calm and stone-faced as he became the first Malaysian leader to be convicted. He has vowed to appeal the verdict and took an oath in brief remarks from the dock before the sentencing that he was unaware of the graft.