Activists of Ukrainian far-right groups burn a fire during their clashing with riot police in front of the Prosecutor General's Office in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

Activists of Ukrainian far-right groups burn a fire during their clashing with riot police in front of the Prosecutor General's Office in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

Activists of Ukrainian far-right groups clash with riot police in front of the Prosecutor General's Office in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

Activists of Ukrainian far-right groups clash with riot police in front of the Prosecutor General's Office in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

Activists of Ukrainian far-right groups clash with riot police in front of the Prosecutor General's Office in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

Activists of Ukrainian far-right groups clash with riot police in front of the Prosecutor General's Office in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

Activists of Ukrainian far-right groups clash with riot police in front of the Prosecutor General's Office in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

Activists of Ukrainian far-right groups clash with riot police in front of the Prosecutor General's Office in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

The Ukrainian riot police guard the Prosecutor General's Office during clashes with activists of Ukrainian far-right groups in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

A woman holds a placard reading "Prosecutor General go to Russia" as the Ukrainian riot police guard the Prosecutor General's Office in Kiev to prevent attacks of activists of the far-right groups on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

A woman holds a placard reading "Prosecutor General go to Russia" as the Ukrainian riot police guard the Prosecutor General's Office in Kiev to prevent attacks of activists of the far-right groups on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

A woman holds a placard reading "Prosecutor General go to Russia" as the Ukrainian riot police guard the Prosecutor General's Office in Kiev to prevent attacks of activists of the far-right groups on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

A woman holds a placard reading "Prosecutor General go to Russia" as the Ukrainian riot police guard the Prosecutor General's Office in Kiev to prevent attacks of activists of the far-right groups on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

A woman stands as the Ukrainian riot police guard the Prosecutor General's Office in Kiev to prevent attacks of activists of the far-right groups on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

An activist protects a fire with umbrella as the Ukrainian riot police guard the Prosecutor General's Office in Kiev to prevent attacks of activists of the far-right groups on September 17, 2018 protesting a decision by the authorities to extradite a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

TOPSHOT - Activists of Ukrainian far-right groups burn a fire during their clashing with riot police in front of the Prosecutor General's Office in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

TOPSHOT - Activists of Ukrainian far-right groups clash with riot police in front of the Prosecutor General's Office in Kiev on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

TOPSHOT - A woman holding a placard reading "Prosecutor General go to Russia" stands next to the Ukrainian riot police in front of the Prosecutor General's Office in Kiev to prevent attacks of activists of the far-right groups on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)

TOPSHOT - A woman stands next to the Ukrainian riot police in front of the Prosecutor General's Office in Kiev to prevent attacks of activists of the far-right groups on September 17, 2018 as the Ukrainian authorities extradited a Russian citizen wanted by Moscow as a suspected Islamic State fighter. - Dozens of protesters, mostly from Ukraine's far-right groups, blocked the entrance to the building of prosecutor general's office with a trash can and set it on fire and then tried to storm it with a demand to sack the deputy prosecutor general who signed the permission to extradite Timur Tumgoyev, AFP photographer reports. (Photo by Sergei SUPINSKY / AFP)