SHAH ALAM, Malaysia -- Two women on trial for the brazen assassination of the North Korean leader's half brother were told Thursday to make their defense after the judge found evidence of a "well-planned conspiracy," extending their murder trial until next year. Indonesia's Siti Aisyah and Vietnam's Doan Thi Huong are accused of smearing VX nerve agent on Kim Jong Nam's face in an airport terminal in Kuala Lumpur on Feb. 13, 2017.

High Court Judge Azmi Ariffin said there was inadequate proof to show it was a political assassination, but he wasn't persuaded by the defense argument that the women thought they were taking part in a prank for a hidden-camera show. But enough evidence had been presented in the six-month trial to infer the women and four North Korean suspects at large had meticulously engaged in a "well-planned conspiracy" to kill Kim "systemically," he said.

"I must therefore call upon them to enter their defense," the judge said after reading his ruling for more than two hours.

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Indonesian Ambassador Rusdi Kirana told reporters outside court that he was shocked by the court's decision but his government will abide by it.

In Huong's village in Vietnam, her family said they were sad to hear she was not acquitted. Her father, Doan Van Thanh, said he could not sleep last night, anxious to hear the ruling.

"I had hoped the court would announce that she is innocent but now we are really worried for her," he said. Huong's brother, Doan Van Binh, said the family hopes she will receive a fair trial.

Aisyah, 25, and Huong, 29, told the court they would testify under oath in their defense. Aisyah, who will be the first to take the stand when the trial resumes Nov. 1, later cried and was consoled by her lawyers and Indonesian officials. Huong was calm. The judge set hearing dates that extend till next February.

Indonesian Siti Aisyah, who is on trial for the killing of Kim Jong Nam, the estranged half-brother of North Korea's leader, is escorted as she leaves at the Shah Alam High Court on the outskirts of Kuala Lumpur, Malaysia, Aug. 16, 2018. REUTERS

The women are accused of colluding with four North Korean suspects who fled the country the same morning Kim was killed. Aisyah and Huong are the only suspects in custody and face the death penalty if convicted.

According to the case presented so far, the four men known to Aisyah and Huong by code names recruited, trained and supplied the women with the banned chemical weapon that they smeared on Kim's face.

Airport security footage shown in court captured the moment of the attack and prosecutors also said the camera images linked the women to the four male suspects. Shortly after Kim arrived at the airport, Huong was seen approaching him, clasping her hands on his face from behind and then fleeing. Another blurred figure was also seen running away from Kim and a police investigator testified that it was Aisyah.

Kim died within two hours of the attack.

Defense lawyers have said the prosecution failed to show the two women had any intention to kill -- key to establishing they are guilty of murder.

But the judge said their intention to kill can be inferred from targeting Kim's eyes, where the nerve agent would penetrate faster. He said evidence pointed to a "simultaneous act" by the women and that their act of hurrying to separate washrooms was not a "mere coincidence" but established their intention to cause Kim's death.

"There is no slightest doubt in my mind that it can be inferred that their desperate act of rushing to the toilet was solely for the purpose to decontaminate the poisonous VX on their hands," Azmi said. He said they seemed worried and tense before washing their hands, but relaxed afterward.

"The onus is on the accused to explain their conduct," he added.

Lawyers for the two women have said their clients were pawns in a political assassination with clear links to the North Korean Embassy in Kuala Lumpur.

The judge said the four North Koreans played a "substantial role" and were "part of the chain that led to the murder" of Kim. The defense has argued the real culprits are the four North Korean suspects and have pointed to an embassy employee who helped arrange their travel as evidence of embassy involvement.

Azmi said he "cannot rule out that this could be a political assassination," but found no concrete evidence of one.

Malaysian officials have never officially accused North Korea and have made it clear they don't want the trial politicized.

Kim, the eldest son in the family that has ruled North Korea since its founding, had been living abroad for years after falling out of favor. It is thought he could have been seen as a threat to North Korean leader Kim Jong Un's rule.