Sunday marks the 5th anniversary of the murder of North Korean leader Kim Jong Un's half-brother, Kim Jong Nam, at Kuala Lumpur International Airport.

An Indonesian woman and a Vietnamese woman were accused of smearing the highly-toxic VX nerve agent on Kim's face. They pleaded not guilty and said they believed the act was part of a prank for a reality TV show. Prosecutors eventually dropped their case against the Indonesian woman. They also dropped the murder charge against the Vietnamese woman and she was sentenced to a lesser charge of causing injury. The women were released and returned to their home countries.

Four North Korean men were suspected to have instructed the women. They are believed to have returned to their country after the attack.

South Korea's intelligence service believes the murder was an organized terrorist attack led by Kim Jong Un, saying the North's secret police was involved.

Kim Jong Nam's body was handed over to North Korea. Pyongyang claims that the cause of death was a heart attack.

Relations between North Korea and Malaysia deteriorated as the North refused to cooperate in the investigation. Pyongyang severed diplomatic ties last year and closed its embassy in Kuala Lumpur.

The North Korean diplomats who left Malaysia are believed to be staying at the North's embassy in Beijing, as they have not been able to return to their country due to the coronavirus pandemic.