Is the Tsar Bomba banned?

Is the Tsar Bomba banned? Thus, Tsar Bomba was viewed as a propaganda weapon. Following the 1961 blast, Sakharov became increasingly involved in efforts to limit nuclear tests to underground. Such a ban was signed by the United States, Britain, and the U.S.S.R. in 1963, and numerous other countries later joined the treaty.

Thus, Tsar Bomba was viewed as a propaganda weapon. Following the 1961 blast, Sakharov became increasingly involved in efforts to limit nuclear tests to underground. Such a ban was signed by the United States, Britain, and the U.S.S.R. in 1963, and numerous other countries later joined the treaty.