According to the winning schedule

The youth team of Russia U-19 held the first two meetings at the World Championships in Tehran. 24 August, our guys with the main squad with the Surgutyan Maxim Kirillov as a setter defeated the strong Belgian national team 3:1 (23:25; 25:23; 25:19; 34:32). The next day, the Russian national team played with an experimental composition and Maxim Kirillov did not take part in the match against the Bulgarians. Victory, Nevertheless, we got it with the same score - 3:1 (21:25; 25:22; 32:30; 25:22). While the team is on a winning schedule, there are two more meetings in the group ahead - with the national teams of Cameroon and Thailand, who are unlikely to be able to prevent the Russians from taking first place in their quintet. In other groups, young volleyball players from Poland took the lead, Italy and Argentina.