Throughout the 1970s, both the Soviet Union and United States replaced old missiles and warheads with newer, more powerful and effective ones. This continued to worsen Soviet - U.S relations. On June 18, 1979, the SALT II treaty was signed in Vienna. This treaty limited both sides ' nuclear arsenals and technology. However, this treaty as well as the era of the détente ended with the Soviet Union 's invasion of Afghanistan in January, 1980. The United States once again significantly increased military and nuclear spending, while the Soviets were unable to respond and continued to pursue the détente.
who won the arms race in the cold war
The United States