In 1959–62, relations between Greece and the USSR entered a new phase. The tactics of the Soviet Union regarding Cyprus in 1955–9 did not pay off, as the rift between Greece, Turkey, and NATO was largely bridged in the aftermath of the 1959 Cyprus agreements. However, the search for a Cold War détente engendered pervasive insecurity in a frontline state like Greece, always afraid that its larger allies might abandon it. Nuclear intimidation, Greek anti-communism on the one hand; on the other, the impressive development of trade relations, created a complex environment. This article, based on the archives of the Greek Foreign Ministry, and the personal archive of the Greek prime minister, Constantine Karamanlis, discusses Athens’ response to the new Soviet policy. © The Author(s), 2020. Published by Cambridge University Press on behalf of Byzantine and Modern Greek Studies.