Why cut down in nuclear weapons?

why was economic issues a reason for both countries?

the arms race was very expensive & a relaxation on Cold War tensions would allow to focus on domestic issues

why was guerrilla wars a reason

nuclear weapons were useless within guerrilla wars

who pressured the US into negotiations

UK, France & West Berlin

what slowed down talks in the USSR

Soviet intervention in Czechoslovakia slowed down talks (the USSR needed to focus on its own sphere of influence)

what slowed down negotiations in the US

Johnson’s declaration that he would not run for re-election November 1968 slowed down talks (the USSR was hesitant to engage in fruitless discussions if Johnson’s successor was uninterested in arms limitation)