Gorbachev and Dubček

 What's the difference between Mikhail Gorbachev and Alexander Dubček?

Nothing, except Gorbachev doesn't know it yet.

A Soviet trade delegation visits Czechoslovakia

 In 1970, a Soviet trade delegation visits Czechoslovakia. When they arrive at the airport in Prague, they're met by the Minister for Trade and climb in his limo. Outside the airport, they pass a great bronze statue of Lenin, which the Minister explains was built out of gratitude for Soviet funds helping build the airport. The delegates note that it's nice, but aren't really impressed.

Later, they drive past a war memorial with a large silver statue of Stalin. The Minister says that it was built to honor the Soviet liberation of Czechoslovakia in World War II. The delegates are impressed; they've seen plenty of war memorials in the Eastern Bloc, but never a silver one.

When they drive through the main square, they pass a great gold statue of Brezhnev, which the Minister says is a symbol of thanks for the Soviets for all their economic and military aid to the country.

The delegates are positively stunned at the sight. "Wow," one says, "the Czechoslovak people must really love their brothers in the Soviet Union!"

The Minister replies, "Yes, we must."

What's the world's largest country

 What's the world's largest country?

Czechoslovakia. The Red Army said they were leaving in 1945, but they still hadn't reached the border in 1968.

Why did the Soviets open fire

 Why did the Soviets open fire on protesters during the Prague Spring?

Because socialism always aims at the common man.