Police used tear gas against the protesters, who are impeding the vehicle taking him for questioning.
Security forces are now searching the flat in the center of the Ukrainian capital, while the former president of Georgia and ex-governor of Ukraine's Odessa Region confined himself to the roof of the building, threatening to jump off. Hundreds of protesters had been blocking the police van with Saakashvili inside during an hours-long standoff with police.
Saakashvili was a key figure in the 2003 Rose Revolution protests in Georgia that ousted the country's president.
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Ukrainian Security Service officers detain Mikheil Saakashvili at his house in Kiev.
Saakashvili was wearing a flag with Ukraine's yellow and blue colors around his neck as he marched in central Kiev surrounded by supporters. The detainee is still inside the police vehicle.
National Guard riot police were dispatched to help the SBU release the van but they soon found themselves surrounded by a crowd of protesters.
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He resigned as Odessa governor in 2016, complaining that his efforts to root out corruption suffered official obstruction.
Around 200 supporters of detained ex-Georgian President Mikhail Saakashvili are blocking roads and erecting barricades in the heart of the Ukrainian capital.
As reported, employees of the Prosecutor General's Office and the Security Service of Ukraine searched Saakashvili's apartment at Kostiolna Street in Kyiv on Tuesday morning. He went up on the roof of his home in Kiev to protest, attracting a crowd of supporters downstairs.
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Saakashvili, who was a regional governor in Ukraine, fell out with Poroshenko over accusations that Kiev was failing to make good on the fight against corruption and was stripped of his Ukrainian passport.