1. Denialism in Criminal Law (Instead of an Introduction). – 2. Research Methodology. – 3. The Thorny Path of Criminalizing Denials in Ukraine. – 3.1. Denial of Genocide. – 3.2. Denial of Fascist Crimes. – 3.3. Denial of Russian Aggression and Occupation. – 4. A Banal Mistake or Conscious Double Criminalisation? – 4.1. The Problem of Double Criminalisation of Public Denial. – 4.2. The Collision. – 4.3. The Option of Resolving the Collision by the Protected Object Rule. – 4.4. The Rule of Temporal Collision. – 4.5. Nullum Crimen, Nulla Poena Sine Lege and the Principle of Equality. – 4.6. In Dubio Pro Homine (Pro Personae). – 5. De Lege Ferenda: Resolving of the Collision. – 6. Conclusions.