Siti Aisyah of Indonesia and Doan Thi Huong of Vietnam are the only two suspects in custody. They are accused of smearing the banned nerve agent VX on Kim Jong Nam's face at a Kuala Lumpur airport terminal on February 13.
They pleaded not guilty at the start of their trial on October 2 and face a mandatory death sentence if convicted.
"We are able to establish that it is not a simple murder. There are a lot of political connotations. All the suspects are North Koreans and the North Korean Embassy was not cooperative in helping police," Aisyah's lawyer, Gooi Soon Seng, told reporters after the court session.
"In this case, the motive appears to be political more than anything else ... and the girls would not have any political motive whatsoever."
But he said the vehicle was registered under the name of Ri Jong Chol, a North Korean man.
Ri, a chemist, was arrested four days after Kim was killed. He was later released due to a lack of evidence and deported because he did not have valid travel documents.
Wan Azirul said Ri did not drive the suspects to the airport and told police before he was deported that Chal Su used his name to buy the car in October last year. He said he couldn't verify Chal Su's status because the North Korean Embassy refused to cooperate.
The two men were later seen meeting with the North Korean suspects, and Wan Azirul said they assisted the four in leaving the country.
Wan Azirul said police had issued arrest warrants for the two but couldn't interrogate them because they were hiding at the North Korean Embassy.
The two were later allowed to leave Malaysia in exchange for nine Malaysians stranded in North Korea, in a deal to end a diplomatic row.
Wan Azirul said three of the four suspects flew to Indonesia's capital, Jakarta, right after Kim was killed, but couldn't confirm a defense assertion that they then flew to Dubai and to Vladivostok in Russia before landing in Pyongyang routes that the defence said are through countries with friendly ties with North Korea.
Wan Azirul said he didn't know if the three men worked for the North Korean Embassy. When asked by the defence whether the fourth suspect flew to Phnom Penh, Cambodia's capital, and stayed there for two days before flying to Bangkok, he said he did not know.
He also said he had sought to take a statement from another North Korean suspect, Ri Ji U, known as James, but didn't receive the green light. Defence lawyer Gooi has said James is believed to have recruited Aisyah.
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