Ukrainian President Volodymyr Zelensky attends a session of the Constitutional Court in Kiev on June 11, 2019 to defend his controversial decision to dissolve parliament and call early elections for July 21. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)

Ukrainian President Volodymyr Zelensky attends a session of the Constitutional Court in Kiev on June 11, 2019 to defend his controversial decision to dissolve parliament and call early elections for July 21. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)

Ukrainian President Volodymyr Zelensky (R) speaks during a session of the Constitutional Court in Kiev on June 11, 2019 to defend his controversial decision to dissolve parliament and call early elections for July 21. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)

Ukrainian President Volodymyr Zelensky attends a session of the Constitutional Court in Kiev on June 11, 2019 to defend his controversial decision to dissolve parliament and call early elections for July 21. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)

Ukrainian President Volodymyr Zelensky attends a session of the Constitutional Court in Kiev on June 11, 2019 to defend his controversial decision to dissolve parliament and call early elections for July 21. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)

Ukrainian President Volodymyr Zelensky attends a session of the Constitutional Court in Kiev on June 11, 2019 to defend his controversial decision to dissolve parliament and call early elections for July 21. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)

Ukrainian President Volodymyr Zelensky (3R) attends a session of the Constitutional Court in Kiev on June 11, 2019 to defend his controversial decision to dissolve parliament and call early elections for July 21. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)

Chairman of the Constitutional Court of Ukraine Natalia Shaptala (2L) speaks during a session of the Constitutional Court in Kiev on June 11, 2019. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)

Ukrainian President Volodymyr Zelensky (C) attends a session of the Constitutional Court in Kiev on June 11, 2019 to defend his controversial decision to dissolve parliament and call early elections for July 21. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)

Activists protest in front of the Constitutional Court building in Kiev on June 11, 2019 against the dissolving of the Ukrainian parliament. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)

Ukrainian President Volodymyr Zelensky (3R) attends a session of the Constitutional Court in Kiev on June 11, 2019 to defend his controversial decision to dissolve parliament and call early elections for July 21. - The Grand Chamber of the Constitutional Court of Ukraine has begun hearings of the case on the legitimacy of the dissolution of the parliament and early elections by appeal of 62 country's lawmakers. (Photo by Genya SAVILOV / AFP)