What event in 1979 dealt a death blow to détente?

Name: What event in 1979 dealt a death blow to détente?
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The Soviet invasion of Afghanistan in 1979 led to an increase in tensions between the US and USSR, as the US saw it as an aggressive move by the Soviet Union. This event led to the US boycotting the 1980 Olympics in Moscow and increasing military spending, effectively ending the détente period of improved relations between the two superpowers.

What Event in 1979 Dealt a Death Blow to Détente