The 10th China-Russia Expo opened in Harbin City, northeast China's Heilongjiang Province, on Sunday.

The expo, running until May 21, covers a total exhibition area of 55,000 square meters and features more than 1,500 Chinese and foreign companies from 46 countries and regions across the world.

Nearly 300 Russian companies are showcasing their products at the expo, and the number of Russian buyers is expected to exceed 5,000.

Chinese President Xi Jinping and Russian President Vladimir Putin on Sunday sent congratulatory letters, respectively, to the event.