Answer: The invasion marked the end of any further negotiation between the superpowers
Explanation: The Soviet invasion of Afghanistan marked the beginning of renewed hostility as the Second Cold War commenced. The invasion led to widespread condemnation of the Soviet union and led the West to believe that the Soviet union was trying to expand.
As a result of this, President Carter withdrew the SALT II Treaty that would slow down the arms race from the Senate, cut off trade contacts between America and the Soviet union thereby blocking various exports including the much needed grain deliveries. The United States also boycotted the Moscow Olympics in 1980, and increased arms spending, proclaiming the Persian Gulf a vital strategic area for American interests and agreed to supply China with military equipment.