A suspect in the deadly shooting of top Ukrainian politician Andriy Parubiy has been arrested, the country's President Volodymyr Zelensky has said.

The parliamentarian, 54, was gunned down on Saturday in the city's Sykhovsky district by a gunman disguised as a delivery driver, who later fled the scene on a bike.

Ukraine's interior minister Igor Klymenko said in a statement issued in the early hours of Monday morning that the suspect had been detained in the western Khmelnytskyi region.

Taking to X, Zelensky added: 'I spoke with Prosecutor General Ruslan Kravchenko. He reported on the next procedural steps regarding the suspect in the murder of Andriy Parubiy.

'The suspect has given an initial testimony. Urgent investigative actions are currently underway to establish all the circumstances of this murder.