Why didn't the Marshall plan benefit Eastern European countries?

The Marshall Plan primarily focused on Western European countries as a means to contain communism and promote recovery after World War II. Eastern European nations, under Soviet influence, were excluded from the program, as the USSR viewed it as a threat to its control. Additionally, the Soviet Union pressured these countries to reject American aid and instead promote a centralized economic model, limiting their opportunity for recovery and development. As a result, Eastern Europe lagged economically compared to their Western counterparts.