In December 2022, aged just 17, Kozyreva sprayed "Murderers, you bombed it. Judases" in black paint on a sculpture of two intertwined hearts, erected outside St Petersburg's Hermitage Museum & representing the city's links with #Mariupol, a #Ukraine city largely razed to the ground during a siege by #Russia that spring.
In early 2024, after being fined 30,000 roubles ($370) for posting about Ukraine online, Kozyreva was expelled from the medical faculty of St Petersburg State University.