Détente collapsed within a decade. Was it therefore a failure?

THE SHORT ANSWER

• The split that made the triangle possible. The Sino-Soviet alliance died of accumulated insults: Khrushchev’s de-Stalinization (undermining Mao’s cult by proxy), his retreat at Cuba (“capitulationism”), the withdrawn nuclear tutors of 1959, and underneath it all the question of who leads world revolution. By 1969 two communist armies were shooting at each other across the Ussuri — the “monolith” Washington had spent twenty years containing had already broken itself. Kissinger’s insight was not creating the split but pricing it: be closer to each communist power than they are to each other, and both will pay for the privilege.
• Parity made arms control rational. SALT I froze launcher numbers and the ABM Treaty banned nationwide missile defenses — deliberately preserving mutual vulnerability, the cold logic of MAD: if neither side can hope to survive a first strike, neither strikes. Critics called it institutionalized madness; its defenders answered that it was the only stable equilibrium two scorpions in a bottle could reach. Note what it did not cover — warheads (MIRVs multiplied through the loophole), theater weapons (the Euromissile crisis of Ch. 10 grows there) — arms control manages races, it does not end them.
• Economics pressed both ways. The USSR needed Western grain (harvest failures from 1972) and technology; America needed relief from a defense burden wrecking Bretton Woods (Nixon closed the gold window in 1971, ending the dollar’s convertibility — a Cold War cost signal). West Germany needed Eastern markets and family reunification. Détente was, among other things, a set of overdue invoices being netted against each other.

WHAT IT CHANGED

Helsinki’s slow fuse. Within two years of the signature: Moscow Helsinki Group (1976), Charter 77 in Prague, KOR in Poland — dissidence reorganized as compliance monitoring, unpunishable in theory, persecuted in practice, and internationally visible either way. When Gorbachev later needed a language for reform and Eastern Europe needed one for exit, Helsinki had already written it. Basket III is the best case in this atlas for reading the fine print of “symbolic” agreements.

Détente’s decay: the periphery eats the center. Angola (1975), the Horn (1977–78), and Soviet-Cuban logistics behind both convince American critics that Moscow treats détente as cover for advance; Moscow answers that the Third World was never in the agreement — and that Egypt’s defection to Washington (Ch. 8) proves the West plays the same game. Both are right, which is the problem: a rules-based rivalry with no agreed rules for its most active front cannot hold. Afghanistan, December 1979, finishes it.

The dissenters institutionalize. A generation of American hawks — Team B, the Committee on the Present Danger — builds the case that détente ratified Soviet gains and hid a buildup; Reagan will campaign on it. In Moscow, the military-industrial complex pockets parity and keeps building (the SS-20s that detonate the Euromissile crisis deploy from 1977, mid-détente). On both sides, the personnel and arguments of the Second Cold War are assembled inside the First Peace.