The Indonesian suspect in the death of North Korean leader Kim Jong Un's half-brother was paid $90 to help carry out the attack involving VX nerve agent, said Indonesia's deputy ambassador to Malaysia.

But Deputy Ambassador Andriano Erwin repeated Siti Aisyah's previous claim that she was duped into the plot, thinking she was taking part in a prank.

Mr Erwin met Aisyah on Saturday in Malaysia, where the 25-year-old is in custody. Another alleged attacker, a Vietnamese woman, also has been arrested.

According to police, Aisyah rubbed VX nerve agent on the face of Kim Jong Nam amid crowds of travellers at Kuala Lumpur's airport on February 13. Kim was the older half brother of North Korea's ruler.

Meanwhile, Malaysia said it would issue an arrest warrant for a North Korean diplomat wanted for questioning over the murder of Kim Jong Nam if he doesn't voluntarily cooperate with the police.

Eight North Koreans are wanted in connection with the case, including the diplomat. One has been detained by the Malaysian police, four are believed to have fled to North Korea, while two are still in Malaysia.

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