Respuesta :
The Warsaw Pact, a mutual defense treaty organization headed by the USSR, was established in response to the formation of NATO. It consisted of Soviet satellite states and allies.
The correct answer is: "the Warsaw Pact".
The Warsaw Pact was signed in 1955 by the URSS and the group of Eastern European satellite states under its influence. It aimed to establish collective defense mechanisms and to deal with the organization of the regional economy. It was founded as a response to the emergence of the NATO, which was a similar association of countries constituted by the US plus the Western nations under the influence of the first.