The criminal case was triggered by his participation on 15 January 2015 in action supporting Alexei Navalny and his brother Oleg in Moscow's Manezhnaya Square.

Before addition of Article 212.1 to Russia's Criminal Code in July 2014 Dadin could be sentenced to pay fine or a suspended prison term.

But according to the new Article 212.1, if a court has issued two rulings on administrative offences within 180 days the law opens up a sentence of up to 5 years in a prison colony.

[9] Dadin also said that prison workers had hung him by his handcuffs for half an hour and pulled his underwear down, threatening him with rape if he refused to stop a hunger strike he had begun after being deprived of basic necessities such as soap and toilet paper.

[12] Russia's human rights ombudsman Ella Pamfilova criticized the excessive severity of the punishment, promising to send a request to the Constitutional Court.

[17] Ildar Dadin joined the Ukrainian Sibir Battalion of the Civic Council to fight for Siberian independence in June 2023.

[1] Dadin was reported by family and friends to have been killed after his volunteer battalion came under Russian artillery fire while fighting in Kharkiv Oblast.

According to the aforementioned article, repeated violation of the established procedure for organising or conducting a gathering, meeting, demonstration, procession, or picket entails criminal sanction.

[21] After Russian Constitutional Court's Ruling of 10 February No.2-P, many new articles using the "corpus delicti with administrative prejudice" scheme appeared in the text of Criminal Code of Russia.