According to Chinese laws and regulations, if you’re traveling with China Eastern Airlines from mainland China to Minsk (Минск) passing through Russia (as a transfer point), you will need an transit visa for Russia.
However, please note that since your journey is limited to the airport area during layovers in Russia, you might be eligible for a “transit without a visa” scheme. This would depend on the specific details of your flight itinerary and other factors such as nationalities involved.
To confirm this requirement or explore potential exemptions, I recommend consulting with China Eastern Airlines directly, or contacting Russian authorities (e.g., the Russian Embassy in China) to clarify any necessary travel documents for you.