A 57-year-old Swiss man has pleaded guilty in a court in Thailand to charges of insulting the king.

Oliver Jufer was arrested last December after drunkenly spray-painting several portraits of the monarch, King Bhumibol Adulyadej.

In court, Jufer pleaded guilty to five charges under Thailand's draconian lese majeste law.

He is due to be sentenced later this month, and the maximum penalty he could face is 75 years in jail.

Jufer's lawyer said the