European Solidarity (Ukrainian: Європейська солідарність, romanized: Yevropeiska solidarnist, pronounced [jeu̯rɔˈpɛi̯sʲkɐ sɔlʲiˈdarnʲisʲtʲ], YeS) is a political party in Ukraine.

It has its roots in a parliamentary group called Solidarity dating from 2000[6] and has existed since in various forms as a political outlet for Petro Poroshenko.

[12] Initially formed as a social democratic party,[13] it shifted to the centre-right during the formation of Petro Poroshenko Bloc in 2014.

[17][18] Regarding their foreign stances, they support the membership of Ukraine in the European Union and a peaceful end to the Russo-Ukrainian War.

[21][22] Taras Kuzio claims that this happened with the help of then President Kuchma, who allegedly wanted to limit the influence of the SDPU(u).

[21] Many deputies elected in 1998 for the Peasant Party of Ukraine and Hromada joined the new parliamentary faction.

[21][23] Based on his parliamentary faction Poroshenko eventually established the Party of Ukraine's Solidarity.

[27] Top party members who received a parliamentary mandate on party list of the Our Ukraine electoral bloc in 2002 were Volodymyr Plyutynsky, Volodymyr Makeyenko, Eduard Matviychuk, Anatoliy Korchynsky, while a single constituency in Vinnytsia Oblast was won by Petro Poroshenko.

[23] The party could have challenged this on appeal, but did not[23] and was legally eliminated on 31 December 2013 "due to lack of reporting".

[23] Early in 2014, Poroshenko became leader of the National Alliance of freedom and Ukrainian patriotism "OFFENSIVE", which was renamed "All-Ukrainian Union Solidarity".

[31] In the 2006 elections, the party failed as part of the electoral alliance Yuriy Karmazin Bloc to win parliamentary representation.

[31] In the 2007 elections, the party failed again as part of the All-Ukrainian Community to win parliamentary representation.

[32] National Alliance of freedom and Ukrainian patriotism "OFFENSIVE" did not participate in the 2012 parliamentary elections.

[33] In May and June 2014, Ukrainska Pravda characterised the party ("All-Ukrainian Union Solidarity") as "a myth with no website, unknown phone numbers and non existing addresses".

[34][35][36][37][38] During a 27 August 2014 party congress, the "All-Ukrainian Union Solidarity" changed its name to "Bloc of Petro Poroshenko" (Ukrainian: Блок Петра Порошенка, Blok Petra Poroshenka),[39] and elected the former Minister of Internal Affairs, Yuriy Lutsenko, as the new leader of the party.

[40] On 15 September it became clear that 30% of the Petro Poroshenko Bloc election list would be filled by members of UDAR and that UDAR leader Klitschko was at the top of this list; Klitschko vowed not to resign as incumbent Mayor of Kyiv,[41] but on 21 November he gave up his seat in the new parliament.

[42] According to political scientist Tadeusz A. Olszański (in mid-September 2014) this deal with UDAR "enables it to use that party's large-scale structures, which the Poroshenko Bloc itself lacks".

[53] On 18 May 2019, Klitschko announced that UDAR would take part in the 2019 Ukrainian parliamentary election autonomously.

In June 2020, former Secretary of the National Security and Defense Council during Poroshenko's presidency Oleksandr Turchynov became head of the 2020 Ukrainian local elections headquarters of the party.