Alexei Ugarov, Alexei Kalyuzhny and Yevgeni Kovyrshin scored for Belarus.
In the other Group A game, Finland beat France 7-1. Mikko Koivu had a goal and three assists, and Jussi Jokinen scored twice for Finland, the group leader at 4-0-0. Finland will face Canada (3-0-0) on Friday.
In Group B in Stockholm, Evgeni Malkin scored to help Russia beat Denmark 3-1, and the Czech Republic topped Latvia 3-1. Russia and Sweden are tied for the group lead at 4-0-0.