<P> 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 . </P>
<P> 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 . </P>
who won the arms race in the cold war
who won the arms race in the cold war
The United States
The United States