The man who stabbed the girl was involved in the attack on the Kazan Cathedral.
In 2017, Yagova and Gipa Ogli Suleimanov met the organizer Yevgeny Efimov. He reportedly told Suleimanov that he was going to rent a garage or other place to make explosives.
Suleimanov was found guilty of not reporting a crime and was fined 70,000 rubles.