Mironov was first selected to play at the international level with Russia's under-18 Team at the 2012 IIHF World U18 Championships in the Czech Republic. He played in all 6 games for Russia on the blueline on way to a 5th-place finish. Mironov, represented Russia at the 2013 and 2014 World Junior Championships, helping his native country earn a bronze medal at both events while contributing six points in 14 contests.