[7][5][8] As the Deputy Head of the Ministry of Internal Affairs of the Yanukovych administration during the Revolution of Dignity, Tatarov was tied to a number of violent events.

On the night of December 11, 2013, police officers made an unsuccessful attempt to break up Euromaidan barricades in Kyiv, in which more than 5,000 security forces took part.

The attack took place hours after Chernovol published an article on a posh suburban residence which she said was being built for Minister of Internal Affairs Vitaliy Zakharchenko, Tatarov's boss at the time.

[18] On 18 February 2021, the journalists of the "Schemes [uk; et]" program reported that Tatarov, in the midst of the Revolution of Dignity, received the title of "Honored Lawyer of Ukraine" from Yanukovych on the personal application of the then head of the Ministry of Internal Affairs, Vitaly Zakharchenko, submitted on 16 December 2013.

[24] Tatarov's appointment drew immediate and fierce criticism from Euromaidan activists and families of the victims and outrage among the general public.

[25][26][27] On 7 August 2020, the citizens' association "Family of the Heavenly Hundred" opposed the appointment of Tatarov as deputy head of the OPU because of his past, stating that Tatarov had "justified and covered up mass crimes and violations of human rights during the Revolution of Dignity" and that he had worked in the Ministry of Internal Affairs under the leadership of Vitaly Zakharchenko, who fled to Russia after Euromaidan.

[34] According to the Anti-Corruption Action Center, Oleh Tatarov helped Viktor Medvedchuk (to whose youngest daughter Putin is godfather), former deputy head of the Presidential Administration of Ukraine during Viktor Yanukovych's presidency, Andriy Portnov, and Portnov's son of draft age, who left the country on 28 March 2022, escape from Ukraine.

In addition, Oleh Tatarov tried to unblock the accounts of the Mykolaiv Alumina Plant, which is owned by the Russian billionaire Oleg Deripaska, frozen in Ukraine.

[40] The National Anti-Corruption Bureau of Ukraine and the Specialized Anti-Corruption Prosecutor's Office (SAPO) suspected Tatarov of complicity in providing a bribe in the form of a parking space in the "Artemivskyi" housing complex from People's Deputy Maksym Mykytas to Kostyantyn Dubonos, deputy director of the State Scientific Research Expert and Forensic Center of the Ministry of Internal Affairs of Ukraine.

Law enforcement officers believe that at the request of the developers, Tatarov agreed with the Kyiv NDEKC of the Ministry of Internal Affairs in 2020 to write an examination with distorted content, which was later referred to in "UkrBud".

[50][51] The prosecutors who were supposed to present the charges in court were secretly changed to others, and the case was taken from NABU and SAPO and transferred to the Security Service of Ukraine (SBU), which is believed to be a pre-trial investigation body more loyal to Tatarov, due to close friendly ties with the department's leadership.

Tatarov, commenting on the protest outside the President's Office, during which his resignation was demanded, stated that while he is in his position, he intends to continue to promote the policy of reducing the influence on Ukraine of the forces that are trying to impose "foreign rule"[55][56] on the country, a thesis promoted by Russian propaganda after the beginning of the Russian-Ukrainian war in 2014.

In addition, the participants of the action submitted an appeal demanding the release of Oleh Tatarov and other persons who, according to them, appear in corruption cases.

[61][62] On 12 December, Oleg Tatarov announced that he intended to file a lawsuit against NABU director Artem Sytnyk for "protection of honor, dignity and business reputation.

"[63][64] On 21 December, Tatarov wrote a statement about the suspension of his official duties as the deputy head of the Office of the President of Ukraine "in connection with a significant public outcry.

[44] On 23 December 2020, Deputy Prosecutor General Oleksiy Symonenko transferred the case to the Security Service of Ukraine (SBU).

Anti-Corruption Action Center (AntAC) interpreted the decision as legally obliging Venediktova to return the case to NABU.

[44] On 3 December 2020, journalists from Bihus.info released an investigative report in which it is noted that the company "Dairing Capital", which is co-owned by the father-in-law of the deputy head of the Office of the President Oleh Tatarov, Oleksandr Pavlushin, received land for development from the Kyiv City Council immediately after Tatarov was appointed to the Office of the President.

[72] In December 2021, the magazine Focus ranked Tatarov in 12th place among the most influential people of Ukraine because of his increased influence on the judicial system in the country.