An iron curtain has descended across the continent. Behind that line lie all the capitals of the ancient states of Central and Eastern Europe. Warsaw [in Poland], Berlin, Prague [in Czechoslovakia] . . . all these famous cities and the populations around them lie in what I must call the Soviet sphere, and all are subject in one form or another, not only to Soviet influence but to a very high and, in many cases, increasing measure of control from Moscow [the Soviet capital].
—Winston Churchill,
March 5, 1946
What is the main idea of this quote?
The Soviets have built a blockade made of iron to control their territory.
The Soviets are tightening their control over Central and Eastern Europe.
Famous cities in Eastern and Western Europe are now under British control.
It is hard to understand what the Soviets are doing because of the Iron Curtain.