Dlagnev finished fifth at the World Championships in 2011 and 2013, while finishing with a third place bronze medal at the 2012 Olympics. During the wrestling competition at the 2012 Summer Olympics, Dlagnev finished in fifth place after he was pinned by Artur Taymazov from Uzbekistan in the semi-final and suffered a loss against Komeil Ghasemi from Iran in his bronze medal bout due to separated cartilage in his rib cage. On 23 July 2019 it was announced that as a result of retesting samples, Artur Taymazov had been disqualified from the 2012 Olympics for a drug violation, and his gold medal from that event also withdrawn. This result elevated Dlagnev to third place, and is now the 2012 Olympic 120 kg bronze medalist.