Doan Thi Huong was arrested alongside an Indonesian woman, with both accused of carrying out a fatal poison attack on Kim Jong-Nam in Malaysia on February 13.
Leaked CCTV footage from Kuala Lumpur airport shows two women shoving something into Kim's face. The 45-year-old later suffered a seizure and was dead before he reached hospital.
Huong told Vietnam's foreign ministry that she believed she was tricked into killing Kim in a bizarre Cold-War-style killing.
The ministry added it would cooperate with Malaysian authorities in the investigation.
Huong gained notoriety after Malaysian police shared CCTV images of the 28-year-old at the airport wearing a top emblazoned with "LOL" shortly after the high-profile assassination.
Unsubstantiated photographs have circulated on social media showing a woman who looks similar to Huong auditioning for a television talent show.
Others have linked to a YouTube channel apparently showing the same young woman kissing a famous social media prankster.
The Indonesian woman being held over the assassination said earlier she had been paid USD 90 for taking part in what she thought was a TV prank show.
Malaysian police have said Kim was assassinated with VX -- a lethal nerve agent manufactured for chemical warfare and listed by the UN as a weapon of mass destruction.
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