• Photo shows Kim Jong Nam being stretchered at Kuala Lumpur International Airpor on Feb 13, 2017. (Inset) Siti Aisyah, left, and Doan Thi Huong, right. (AAP)
An airport security video has shown what appears to be a practise run of the alleged murder of Kim Jong Un's half brother.
AAP - SBS Wires
11 Oct - 3:34 PM  UPDATED 11 Oct - 4:44 PM

The Vietnamese suspect in the assassination of the estranged half brother of North Korea's leader has been seen on airport security video presented in court smearing something on a person's face two days before Kim Jong Nam was killed in that manner.

The footage showed Doan Thi Huong running toward a person from behind and wiping his face, then clasping her hands and slightly bowing before moving away.

Describing other security videos the day of the murder, police officer Wan Azirul Nizam Che Wan Aziz testified Huong was more "aggressive" when she approached Kim Jong Nam compared to the practice incident.

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Wan Azirul, the chief police investigator, said Huong arrived at the Kuala Lumpur airport two hours before the attack and bought a taxi voucher.

The attack on Kim took place about 9am on February 13 in the airport's departure hall. After smearing Kim's face, Huong hurried away from Kim and "her hand gestures showed she was uncomfortable," wan Azirul said. She walked swiftly to a restroom one floor below, keeping her hands partially raised and her palms away from her body as if to avoid contact.

Prosecutors said previously they would present evidence the two murder suspects knew they were handling poison when they killed Kim. Their defense lawyers have said the women were duped by suspected North Korean agents into believing they were playing a harmless prank for a TV show.

Vietnamese Doan Thi Huong, 28, who was detained in connection with the death of Kim Jong-Nam, is escorted by Malaysian police

Kim Jong Nam, half-brother of North Korean leader Kim Jong Un, is stretchered at Kuala Lumpur International Airport in Sepang, Malaysia.

Huong was in the restroom for just over a minute, and the police investigator testified she was more relaxed and her hands were in normal position after she left the restroom. She then headed to the taxi queue and was joined by the second suspect, Siti Aisyah from Indonesia, shortly afterward.

Other witnesses have testified that VX nerve agent was detected on Kim's face and on the suspects' clothing and on Huong's fingernails clippings. Witnesses also testified that washing hands could remove the oily substance.

Huong and Aisyah have pleaded not guilty to murder charges that carry a mandatory death sentence if they are convicted.

Kim Jong Nam, left, exiled half-brother of North Korea's leader Kim Jong Un, in Narita, Japan, on May 4, 2001, and North Korean leader Kim Jong Un in 2016.