To this day, I guarantee that the Russians are kicking themselves for not whacking us back in 1979.
If you had asked me in 1978/79 if the Soviets were going to move on us, I would have answered that they were probably were, and would do it in about 1983/4, because that was where our military decay and their growth were going to meet, and if they missed that window then it could be 20 years or more before such an opportunity showed up again. Upon his election, Reagan set out immediately to disrupt that scenario and timing.