MOSCOW — After repeated failed attempts to lock up or at least muzzle Mikheil Saakashvili, the former president of Georgia, Ukrainian security officers on Monday grabbed the now stateless ex-leader in a restaurant and bundled him onto an aircraft bound for Poland.

A spokeswoman for Mr. Saakashvili said he had been detained during lunch at a Georgian restaurant in Kiev, the capital of Ukraine, by armed men in camouflage uniforms from Alfa, a unit of Ukraine’s internal security agency, and the border guard service. He was then sent, against his will, to Warsaw, she said.

Video footage of the scene in the restaurant showed members of Mr. Saakashvili’s lunch party scuffling with security agents, and unidentified men rolling about the floor.

Mr. Saakashvili, a former ally turned critic of Ukraine’s president, Petro O. Poroshenko, entered Ukraine from Poland in September, accompanied by a throng of supporters who surged past border guards.