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The big idea: For most of the Cold War the Soviet Union was one of only two world superpowers, standing against the United States.
Its power rested on three things: a huge command economy, a massive nuclear arsenal, and control of an allied bloc in Eastern Europe.
The USSR came out of the Second World War victorious but scarred — around 27 million Soviet citizens had died. That memory of invasion shaped everything its leaders did next.
Above all, Soviet leaders wanted security. They believed the best way to be safe was to surround the USSR with friendly, communist governments so that no enemy could ever march on Moscow again.
- Command economy — the state set production targets and owned industry; strong for building tanks and steel, but slow to make the everyday goods people wanted.
- Nuclear arsenal — after testing its first atomic bomb in 1949, the USSR built enough weapons to match the USA, creating a balance of terror.
- The Eastern bloc — the communist states of Eastern Europe, tied to Moscow and, from 1955, joined in a military alliance called the Warsaw Pact.
Why 'buffer zone' matters: A buffer zone is a ring of friendly states protecting a country from attack. The wish for a buffer zone in Eastern Europe is the single idea that explains most Soviet policy — remember it.
Soviet Cold War policy was not fixed — it changed sharply with each leader. Three men matter most for your exam: Stalin, Khrushchev and Gorbachev.
Stalin (to 1953) — build the buffer
Stalin turned the Red Army's wartime advance into control of Eastern Europe, installing communist governments to form a security buffer. In 1948–49 he cut off West Berlin (the Berlin Blockade) to force the West out; the Berlin Airlift beat him. His actions are seen as a key origin of the Cold War.
Khrushchev (1953–64) — thaw and danger
Khrushchev preached 'peaceful coexistence' with the West and launched de-Stalinization, criticising Stalin's crimes. Yet he also crushed the 1956 Hungarian Uprising, triggered the Berlin Crisis (the Wall, 1961) and gambled on the Cuban Missile Crisis (1962) — the closest the world came to nuclear war.
Gorbachev (1985–91) — let go
Facing economic collapse, Gorbachev introduced glasnost (openness) and perestroika (restructuring). His 'New Thinking' in foreign policy dropped the idea that Moscow would use force to hold the bloc, ending the Cold War and, unintentionally, the USSR itself.
Stalin BUILDS the bloc · Khrushchev SHAKES it · Gorbachev RELEASES it.
Stalin and the origins of the Cold War: By 1948 communist governments loyal to Moscow controlled Poland, Hungary, Romania, Bulgaria, Czechoslovakia and East Germany.
To the West this looked like aggressive expansion; to Stalin it was defensive security. This clash of views is at the heart of why the Cold War began.
The Berlin Blockade, 1948–49: When the Western powers moved to create a stronger, currency-reformed West Germany, Stalin blockaded all land routes into West Berlin, hoping to squeeze the West out.
The West responded with the Berlin Airlift, flying in supplies for nearly a year. Stalin backed down — the first great confrontation of the Cold War, and a Western victory.
Don't over-simplify Khrushchev: Khrushchev looks like a contradiction: he wanted 'peaceful coexistence' yet caused the era's most dangerous crises.
Hold both ideas together — he genuinely sought to avoid all-out war, but still defended Soviet control and prestige with force and brinkmanship.
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Behind the individual leaders lay a few consistent strands of Soviet policy. Knowing them lets you write about continuity as well as change.
Security through a buffer zone
The oldest, deepest aim: keep Eastern Europe communist and loyal so the USSR is protected from invasion. This runs from Stalin all the way to the 1980s.
The Brezhnev Doctrine
After crushing the 1968 Prague Spring in Czechoslovakia, the USSR declared 'limited sovereignty' — the idea that Moscow could intervene by force in any socialist state that strayed from communism.
Support for communist movements
The USSR aided communist and left-wing movements worldwide — in Korea, Vietnam, Cuba, Africa and Afghanistan — spreading its influence and rivalling the USA globally.
The Brezhnev Doctrine in one line: Limited sovereignty: no Eastern bloc country was truly free to leave communism, because the USSR reserved the right to send tanks — as it had in Hungary (1956) and Czechoslovakia (1968).
By the 1980s these pillars were crumbling under economic strain. The command economy could build missiles but not feed shops or keep up with Western technology.
The arms race, the huge cost of propping up the bloc, and a grinding war in Afghanistan from 1979 drained the Soviet budget. Gorbachev inherited a superpower that could no longer afford to be one.
Domestic pressure (the cause)
- A stagnant command economy falling behind the West
- Empty shops and low living standards feeding discontent
- The crushing cost of the arms race and nuclear parity
- The expense of subsidising the Warsaw Pact and the Afghan war
Foreign-policy change (the result)
- 'New Thinking' — cooperation with the West to cut military costs
- Arms-reduction deals with the USA to ease the burden
- Abandoning the Brezhnev Doctrine — no more force to hold the bloc
- Withdrawal from Afghanistan (completed 1989)
Gorbachev's crucial choice, 1989: When Eastern Europeans rose against communism in 1989, Gorbachev refused to send in the tanks — quietly ditching the Brezhnev Doctrine.
Without Soviet force to hold them up, the communist governments fell one after another, and the Cold War ended peacefully.