The pair could face the death penalty if found guilty of Kim Jong Nam's murder
Indonesian Siti Aishah, 25, and Doan Thi Huong, 28, from Vietnam, face the death penalty if convicted of murdering Kim Jong Nam at Kuala Lumpur International airport on Feb. 13.
The two women allegedly smeared Kim's face with the toxic VX nerve agent, a chemical described by the United Nations as a weapon of mass destruction.
Aishah and Huong have told diplomats from their countries that they had believed they were carrying out a prank for a reality television show, and not a murder.
U.S. and South Korean officials say the murder was orchestrated by the North's leader Kim Jong Un. Kim Jong Nam, the eldest son of the late North Korean leader Kim Jong Il, had spoken out publicly against his family's dynastic control of the isolated, nuclear-armed nation.
Lawyers for Aishah and Huong told a Malaysian magistrate court on Thursday that police had not responded to requests to provide evidence including CCTV recordings and statements from three North Korean suspects allowed to leave the country.
Kim Jong Nam is the estranged half brother of Kim Jong Un
The women wore bullet-proof vests to their trial in case they were ambushed
The three North Koreans were allowed to return to Pyongyang late last month, along with the body of Kim Jong Nam, as part of a swap deal with North Korea, which had banned nine Malaysians from leaving the country in a diplomatic spat.
“We've lost an opportunity to cross-examine them… There should be no trial by ambush,” Aishah's lawyer Gooi Soon Seng told reporters outside the courthouse.
Gooi also said one of the three suspects who was allowed to leave Malaysia, Ri Ji U, also known as James, was a key witness and his return to Pyongyang has “compromised” the defence.
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The pair claim they thought they were pulling a prank for a TV show
Hisyam Teh, Huong's lawyer, requested police to furnish evidence such as photos and communications from the two phones seized from her.
Four other North Koreans have also been identified by Malaysian police as suspects. They are believed to have left Kuala Lumpur for Pyongyang on the day of the killing.
The magistrate court was set to hear the prosecutors' request that the two women be tried jointly in a higher court, but the hearing was deferred to May 30 after the prosecution requested more time to collect the required documents.