Is the trial of Najib Razak a political vendetta?

Najib Razak was Malaysia's Prime Minister until two months ago.
Now he's a political outcast, trying to avoid being sent to prison for 20 years.

Najib's the first person to appear in court in connection with the 1-MDB scandal and the disappearance of four billion dollars of taxpayer's money.

He's pleading not guilty and accused the new government led by Mahathir Mohamed of seeking political vengeance. What are the implications of Najib's trial?