Thousands of demonstrators protested Tuesday in front of the Ukrainian parliament urging the government to take measures against corruption as well as to reform the country's electoral legislation.
The rally was called by opposition parties including the Movement of New Forces (Rukh Novykh Syl) created by Mikheil Saakashvili, a now stateless former Georgian president who served two terms and is a former ally of Ukrainian President Petro Poroshenko.
Saakashvili, who was granted a Ukrainian passport in 2014 and thus lost his Georgian nationality, currently faces a Georgian extradition order on four criminal charges.
Poroshenko appointed him as governor of Ukraine's Oblast (region) of Odessa in 2015, a post from which Saakashvili resigned in 2016 over lack of reform and Poroshenko's alleged backing of corrupt officials.
While in the United States this year, Saakashvili had his Ukrainian nationality revoked and became a stateless citizen, but vowed to return to Ukraine.
On Sept. 11, he entered Ukraine via the border with Poland on foot, and he was allowed to continue on to Kiev.
Saakashvili was set to attend a series of demonstrations in the Ukrainian capital calling for a series of demands, included the reform of the parliamentary electoral system, along with supporters of opposition parties.
Former Ukrainian Prime Minister Yulia Tymoshenko, leader of the Homeland (Batkivshchina) party, also announced her intention of joining the protests.
Kiev's authorities have deployed a large police presence to guarantee public order.
Ukraine's presidential office announced meanwhile that Poroshenko had forwarded a bill to terminate parliamentary members immunity as stated in the country's constitution.
The president's bill satisfies one of the opposition's demands and will come into force on Jan. 1, 2020, should it be approved.