In 1979, 75,000 soviet troops invaded afghanistan to support a marxist government. what effect did the soviet war in afghanistan have on the later dissolution of the soviet union? a) the invasion led to support from the united states and was a key factor in the period of detente that followed. b) the success of this invasion raised confidence in the government and put off the break-up for at least a decade. c) the invasion further isolated the soviets as islamic nations such as saudi arabia and egypt joined the united states in protest. eliminate d) the war drained soviet resources, alienated citizens and resulted in increased economic and military pressure from the united states.