The two women accused of killing the North Korean leader's half brother have toured the Malaysian airport as participants in their murder trial visited the scene of the attack.

The judge, prosecutors, defence lawyers and representatives of the women's home countries were escorted inside the Kuala Lumpur airport today by heavily armed police on a visit meant to give the trial participants a better perspective of events as they unfolded.

Indonesian Siti Aisyah and Doan Thi Huong of Vietnam appeared subdued as the group moved around.

The women, who have pleaded not guilty, were handcuffed and wearing bulletproof vests as they have often since their arrests.

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High Court Judge Azmi Ariffin visited the check-in kiosk in the budget terminal where the two women allegedly smeared VX nerve agent onto Kim Jong Nam's face on February 13.

The judge followed the path Kim walked to the airport clinic, seeking help after being attacked, and retraced the movement of the two women, who were seen on security footage rushing to restrooms afterward to wash their hands.

Kim Jong Nam. Photo / AP
Kim Jong Nam. Photo / AP

Huong and Aisyah are the only two suspects detained in the brazen assassination of Kim, an outcast from North Korea's ruling family who lived abroad in virtual exile for years.

Their defence lawyers have said the women were duped by suspected North Korean agents into believing they were playing a harmless prank for a TV show.

- AP