Why did V. M. Molotov object to the Marshall Plan?
He called it "imperialistic" and the Eastern bloc wasn't going to benefit from it.
Vyacheslav Molotov was the Soviet Union's Minister of Foreign Affairs from 1939 to 1949. He began his career as a signatory to a failed Non-Aggression Pact with Germany and had little choice but to endorse an alliance with the West against Germany.
After the war ended 1n 1945, the US committed over $10 billion (in 1945 dollars) to salvage the economies and infrastructures of Western Europe--but nothing for their former Soviet allies. The presumption was that the US was preparing for another war, this time against the USSR, and was outright bribing West Germany and Western Europe to take America's side in an anti-Communist crusade.
The Korean War largely confirmed his fears, but by then he was largely out of favor with Stalin.