If the latest round of sanctions against North Korea put leader Kim Jong Un in a bad mood, political upheavals in two of his biggest adversaries are giving him a reason to smile.

Official media on Sunday showed the young leader chuckling as commandos set ablaze a mock-up of South Korea's presidential Blue House.

One newspaper on Tuesday called President Park Geun-hye — who was impeached last week — a traitor who should be drowned in the sea of candles raised by protesters.