Legally[clarification needed] it is the successor of Political Party "European Capital" (Ukrainian: Політична партія "Європейська столиця") which was registered in March 2005. In its last outing the party was founded on April 24, 2010, on the basis of the Vitali Klitschko Bloc (Ukrainian: Блок Віталія Кличка), a local political alliance in Kiev (the capital of Ukraine).
On a party congress, held on 24 April 2010, the Political Party "New Country" (founded in 2005 as Political Party "European Capital and renamed into "New Country" 14 months before April 2010) renamed itself into Ukrainian Democratic Alliance for Reform and elected boxer Vitali Klitschko as its leader. The party officially became Ukrainian Democratic Alliance for Reform (UDAR) of Vitali Klitschko mid-July 2010.
Starting in March 2010 the party's popularity in opinion polls reached a level almost twice as high as the election threshold (which was raised to 5% in November 2011). The election list of the party was a mixture of candidates who used to represent parties from all over the political spectrum of Ukraine.
After a successful application the European People's Party started on 5 April 2012 the process of making UDAR an observer member of the organization.
In July 2012 party leader Klychko stated that his party would not cooperate with the Party of Regions in a new parliament.
Early August 2012 the party complained its candidates for people's deputies (and all other parties not involved in the first Azarov Government) suffered "psychological and physical pressure" and this "ten times higher than other parties".
Two weeks before the 28 October 2012 Ukrainian parliamentary election UDAR withdrew 26 of its candidates running in single-member constituencies in favour of Batkivshchyna candidates and Batkivshchyna withdrew 26 parliamentary candidates in favor of UDAR in an attempt to maximise votes for the opposition. In the election the party won 13.97% of the national votes and 6 constituencies (it had competed in 183 of the 225 constituencies) and thus 40 parliamentary seats. Support for UDAR was the least diversified at the regional level compared with the results of the other leading parties. Independent candidates Yaroslav Dubnevych and Fedir Nehoi joined the UDAR parliamentary faction on 12 December 2012; the same day party leader Klitschko was elected to lead the party's faction.
 The party is coordinating its parliamentary activities with Batkivshchyna and Svoboda.
Party leader Klitschko confirmed on 28 February 2014 that he would take part in the 2014 Ukrainian presidential election(, this also ended the May 2013 agreement to coordinate with Batkivshchyna and Svoboda). But on 29 March 2014 announced that he had changed his mind and would run for the post of Mayor of Kiev in the 2014 Kiev local election (including Mayoral elections) set for 25 May 2014. In the 2014 Ukrainian presidential election Klitschko endorsed the candidacy of Petro Poroshenko. Klitschko won Kiev's mayoral elections with almost 57% of the votes. Poroshenko was elected President of Ukraine on 25 May 2014. Klitschko was sworn in as Mayor on 5 June 2014. The same day the Ukrainian parliament had deprived Klitschko of his MP mandate (Ukrainian MPs are not entitled to combine parliamentary activities with any other public employment). Hence Vitaliy Kovalchuk was elected to lead the party's faction in parliament on 7 June 2014.
Merge into the Petro Poroshenko Bloc
On 2 September Kovalchuk stated that since his party and Petro Poroshenko Bloc had agreed to "joint participation in parliamentary elections" on 29 March 2014 the two parties were "in discussion" about "the format" for how to do so in the (late) October 2014 Ukrainian parliamentary election. 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 Vitali Klitschko is at the top of this list, Klitschko vowed not to resign as incumbent Mayor of Kiev. Petro Poroshenko Bloc went on to win the 2014 Ukrainian parliamentary election with 132 seats; surpassing the runner up People's Front which won 82 seats. However, People's Front did perform better than the Petro Poroshenko Bloc with 0.33% in the nationwide election under party lists (22.14% against 21.81%) but the party did win 69 constituency seats while People's Front won only 18 constituencies.
On 28 August 2015 Petro Poroshenko Bloc and UDAR merged into 1 party, Petro Poroshenko Bloc. At the unifying congress (of 28 August 2015) Klitschko was elected as leader of this party.
In 2017 UDAR was still registered as a political party and it employed two persons. According to former UDAR member and Ukrainian lawmaker Dmytro Belotserkovets it was necessary that "the party performs only the technical functions necessary in terms of Ukrainian legislation."
On 4 June Klitschko offered former President of GeorgiaMikheil Saakashvili to join the leadership of his party and to take part in the July 2019 early parliamentary elections with UDAR, Saakashvili turned down the offer.
In the July 2019 Ukrainian parliamentary election the party will only compete in 15 single-mandate constituencies.
Ideology and political positions
UDAR tends to avoid sensitive and polarising subjects and focuses instead on popular topics, such as more empowerment to ordinary Ukrainians and a ruthless campaign against corruption, the indifference of the authorities, the lack of local governance, inequality, and poverty. The party wants to "unleash the power of the state and provide conditions for welfare".
UDAR wants to reduce the number of state agencies in order "to minimize the interaction of the citizen with an official". And it wants to simplify procedures for registering property. It wants to reduce the number of taxes from 23 to 7 and to generally simplify the taxing system. "Owners of the land for agricultural purposes" should only be citizens of Ukraine.