 Complete the following phrase:  Negotiations for START I began in May 1982, but continued negotiation of the START process was delayed several times because US agreement terms were considered non-negotiable by pre-Gorbachev Soviet rulers. Reagans introduction of the Strategic Defense Initiative SDI program in 1983 was viewed as a threat by the Soviets, who withdrew from setting a timetable for further negotiations. In January 1985, however, US Secretary of State George Shultz and Soviet Foreign Minister Andrei Gromyko discussed a formula for a three-part negotiation strategy that included intermediate-range forces, strategic defense, and missile defense. During the 