In April 1978, the Saur Revolution overthrew Afghanistan's government and brought the communist People's Democratic Party of Afghanistan (PDPA) to power.
The PDPA introduced radical modernisation reforms - land redistribution, women's rights, and secular education - that alienated traditional tribal and religious leaders.
Armed resistance from mujahideen (Islamic guerrilla fighters) spread rapidly across the countryside, threatening the survival of the PDPA regime.
The PDPA was deeply divided between two rival factions - Khalq and Parcham - and internal power struggles weakened the government further.
In September 1979, Hafizullah Amin seized power and proved increasingly independent from Moscow, raising Soviet fears that Afghanistan could leave the Soviet sphere.
Afghanistan bordered the Soviet Central Asian republics - Moscow feared that Islamic fundamentalism could spread to its own Muslim populations if the PDPA collapsed.
Note
The Brezhnev Doctrine asserted the USSR's right to intervene in socialist states to prevent them from leaving the communist bloc - this was a key justification for the invasion.
The mujahideen were not a single unified group but a loose coalition of diverse factions united primarily by opposition to the PDPA and Soviet influence.
The Soviet Invasion (December 1979)
On 24 December 1979, Soviet forces entered Afghanistan - within days, over 80,000 troops were deployed, and Amin was killed and replaced by the more compliant Babrak Karmal.
Brezhnev's reasons for invading included protecting a communist ally, preventing Islamic radicalism from spreading, and countering potential Western influence on the USSR's southern border.
The invasion reflected a "domino theory in reverse" - the USSR feared that losing Afghanistan would trigger the collapse of other Soviet-aligned states in the region.
The Soviets expected a quick operation to stabilise the country, but the mujahideen resistance proved far more effective than anticipated.
The invasion was internationally condemned - the UN General Assembly voted 104 to 18 demanding Soviet withdrawal, but the USSR used its veto in the Security Council to block binding action.
Analogy
The Soviet invasion of Afghanistan was like stepping into quicksand - the more force the USSR applied, the deeper it sank into an unwinnable conflict.
Like a doctor who makes the patient sicker, the Soviet intervention was intended to stabilise Afghanistan but instead deepened the crisis and spread instability.
Impact on Detente and the Cold War
The invasion effectively ended detente - President Carter described it as "the most serious threat to peace since the Second World War."
Carter announced the Carter Doctrine (January 1980), stating that the USA would use military force to defend its interests in the Persian Gulf region.
The US Senate refused to ratify the SALT II arms limitation treaty, which had been signed in June 1979 - this ended a key element of superpower cooperation.
The USA led a boycott of the 1980 Moscow Olympics, with over 60 nations refusing to attend - the USSR retaliated by boycotting the 1984 Los Angeles Olympics.
The USA imposed economic sanctions including grain embargoes and restrictions on technology transfers, increasing economic pressure on the USSR.
Common Mistake
Do not suggest that the invasion single-handedly ended detente - detente was already weakening due to disagreements over SALT II, human rights, and the deployment of SS-20 missiles in Europe.
Avoid describing the mujahideen as "freedom fighters" without qualification - their motivations and methods varied widely, and US support had complex long-term consequences.
US Support for the Mujahideen and the Soviet "Bleeding Wound"
The CIA launched Operation Cyclone, a covert programme to supply the mujahideen with weapons, funding, and training - it became one of the largest covert operations in CIA history.
From 1986, the USA supplied Stinger missiles - portable anti-aircraft weapons that neutralised Soviet air superiority and dramatically increased mujahideen effectiveness.
Pakistan and Saudi Arabia also supported the mujahideen, channelling weapons and funds through Pakistan's ISI (Inter-Services Intelligence).
Soviet leader Gorbachev described Afghanistan as a "bleeding wound" - by 1988, approximately 15,000 Soviet soldiers had been killed and over 35,000 wounded.
The war cost the USSR an estimated 8 billion dollars per year, draining resources from an already struggling Soviet economy and undermining public morale.
Over 1 million Afghan civilians were killed and approximately 5 million became refugees, creating a humanitarian catastrophe.
Case study
Operation Cyclone - the CIA's covert programme to arm the mujahideen became one of the most significant proxy operations of the Cold War, costing over 3 billion dollars between 1979 and 1989.
The introduction of Stinger missiles in 1986 was a turning point - they destroyed Soviet helicopter gunships and forced a change in tactics that accelerated the decision to withdraw.
Geneva Accords and Soviet Withdrawal (1988-1989)
The Geneva Accords (April 1988) were signed between Afghanistan, Pakistan, the USA, and the USSR, providing a framework for Soviet withdrawal.
Soviet troops completed their withdrawal on 15 February 1989 - the last Soviet soldiers crossed the Friendship Bridge out of Afghanistan, ending nearly a decade of occupation.
The communist government in Kabul survived until 1992 but eventually collapsed, leading to civil war and ultimately the rise of the Taliban.
Significance for the Cold War
Afghanistan is often called the "USSR's Vietnam" - like the US experience in Vietnam, the Soviets found that military superiority could not defeat a determined guerrilla insurgency.
The war exposed the limitations of Soviet military power and damaged Soviet prestige and credibility both domestically and internationally.
The economic cost of the war contributed to the economic crisis that undermined the USSR in the 1980s and strengthened the case for Gorbachev's reforms (glasnost and perestroika).
The invasion contributed to the "New Cold War" of the early 1980s - Reagan's massive military build-up and aggressive rhetoric were partly a response to Soviet actions in Afghanistan.
The failure in Afghanistan weakened Soviet resolve to maintain control over Eastern Europe and contributed to the eventual collapse of the Soviet Union in 1991.
However, tensions were also limited - the conflict remained a proxy war, communication channels between the superpowers were maintained, and neither side used nuclear weapons.
Exam technique
Paper 2 essays on Afghanistan often ask you to assess the invasion's impact on detente - distinguish between Afghanistan as a cause versus a symptom of detente's collapse, using specific evidence.
Link the invasion to its long-term consequences - the weakening of the USSR, the rise of Islamic extremism, and the end of the Cold War.
Compare Afghanistan with other Cold War crises (Korea, Vietnam) to demonstrate thematic understanding of patterns in superpower confrontation.
Historiography
Orthodox historians argue the invasion was a clear act of Soviet expansionism driven by the desire to extend communist influence, justifying the strong Western response.
Revisionist historians such as Odd Arne Westad emphasise that the invasion was primarily a defensive reaction to instability on the Soviet border, not part of a grand plan for global expansion.
Theory of Knowledge
To what extent does describing events as "invasions" versus "interventions" reflect the political perspective of the speaker rather than the nature of the event itself?
How does our knowledge of the long-term consequences (Taliban, 9/11) shape how we interpret the original Soviet decision to invade - is this a form of hindsight bias?
Active recall
Why did the USSR decide to invade Afghanistan in 1979, and what role did the Brezhnev Doctrine play?
How did the invasion affect detente and what specific measures did the USA take in response (Carter Doctrine, SALT II, Olympic boycott)?
In what ways did US support for the mujahideen through Operation Cyclone intensify the proxy conflict?
To what extent was Afghanistan the "USSR's Vietnam", and how did it contribute to the collapse of the Soviet Union?
Evaluate whether the Soviet invasion of Afghanistan increased or limited Cold War tensions - consider both the escalation of the New Cold War and the constraints that prevented direct superpower conflict.