Members of the nationalist movement carry torches during a rally marking Fatherland Defender Day in centre Kiev, Ukraine, Saturday, Oct. 14, 2017. Thousands of people attended the rally. (AP Photo/Efrem Lukatsky), APTOPIX

Members of the nationalist movements light flares during a rally marking Fatherland Defender Day in centre Kiev, Ukraine, Saturday, Oct. 14, 2017. (AP Photo/Efrem Lukatsky)

Members of the nationalist movement carry torches during a rally marking Fatherland Defender Day in centre Kiev, Ukraine, Saturday, Oct. 14, 2017. (AP Photo/Efrem Lukatsky)

Members of the nationalist movement carry torches during a rally marking Fatherland Defender Day in centre Kiev, Ukraine, Saturday, Oct. 14, 2017. (AP Photo/Efrem Lukatsky)

Members of the nationalist movement carry torches during a rally marking Fatherland Defender Day in centre Kiev, Ukraine, Saturday, Oct. 14, 2017. Dozens of thousands people attend a rally in centre Kiev. (AP Photo/Efrem Lukatsky)

Members of the nationalist movements light flares during a rally marking Fatherland Defender Day in centre Kiev, Ukraine, Saturday, Oct. 14, 2017. (AP Photo/Efrem Lukatsky)

A veteran from the war conflict in Ukraine's east shouts slogans during a rally marking Fatherland Defender Day in centre Kiev, Ukraine, Saturday, Oct. 14, 2017. (AP Photo/Efrem Lukatsky)

Ukrainian far-right activists hold flares during a march in central Kiev on October 14, 2017. From ten to twenty thousands of far-right activists gathered in the Ukrainian capital on October 14, 2017 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Ukrainian far-right activists hold flares during a march in central Kiev on October 14, 2017. From ten to twenty thousands of far-right activists gathered in the Ukrainian capital on October 14, 2017 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Ukrainian far-right activists hold flares during a march in central Kiev on October 14, 2017. From ten to twenty thousands of far-right activists gathered in the Ukrainian capital on October 14, 2017 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Ukrainian far-right activists hold flares during a march in central Kiev on October 14, 2017. From ten to twenty thousands of far-right activists gathered in the Ukrainian capital on October 14, 2017 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Ukrainian far-right activists hold torches during a march in central Kiev on October 14, 2017. From ten to twenty thousands of far-right activists gathered in the Ukrainian capital on October 14, 2017 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Ukrainian far-right activists hold flares during a march in central Kiev on October 14, 2017. From ten to twenty thousands of far-right activists gathered in the Ukrainian capital on October 14, 2017 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Activists of far-right Ukrainians parties and the movements burn fire torches during a march in central Kiev on October 14, 2017. From ten to twenty thousands of far-right activists gathered in the Ukrainian capital on October 14, 2017 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Ukrainian far-right activists hold torches during a march in central Kiev on October 14, 2017. From ten to twenty thousands of far-right activists gathered in the Ukrainian capital on October 14, 2017 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Ukrainian far-right activists hold torches during a march in central Kiev on October 14, 2017. From ten to twenty thousands of far-right activists gathered in the Ukrainian capital on October 14, 2017 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Ukrainian far-right activists hold flares during a march in central Kiev on October 14, 2017. From ten to twenty thousands of far-right activists gathered in the Ukrainian capital on October 14, 2017 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Supporters of Ukrainian far-right parties and movements march during a demonstration in central Kiev on October 14, 2017. Thousands of Ukrainian nationalists gathered in the heart of the Ukrainian capital on October 14 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Supporters of Ukrainian far-right parties and movements march during a demonstration in central Kiev on October 14, 2017. Thousands of Ukrainian nationalists gathered in the heart of the Ukrainian capital on October 14 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY

Supporters of Ukrainian far-right parties and movements march during a demonstration in central Kiev on October 14, 2017. Thousands of Ukrainian nationalists gathered in the heart of the Ukrainian capital on October 14 to celebrate the 75th anniversary of the establishment of the Ukrainian Insurgent Army (UPA). / AFP PHOTO / Sergei SUPINSKY