 Complete the following phrase:  Khrushchev was personally troubled by the power of nuclear weapons and would later recount that he believed the weapons could never be used. In the mid-1950s, Khrushchev took a keen interest in defense policy and sought to inaugurate an era of détente with the West. Initial efforts to reach accords, such as on disarmament at the 1955 Geneva Summit, proved fruitless, and Khrushchev saw test-ban negotiations as an opportunity to present the Soviet Union as both powerful and responsible. At the 