Which nation tested the most powerful nuclear weapon ever detonated?

Question

The "Treaty Banning Nuclear Weapon Tests In The Atmosphere, In Outer Space And Under Water", known as the "Partial Test Ban Treaty", "Limited Test Ban Treaty" and "Nuclear Test Ban Treaty", introduced in 1963, was signed by a number of countries including the UK, the USA and which other?

Answer 1

sar Bomba was the Western nickname for the Soviet RDS-220 hydrogen bomb (code name Ivan or Vanya), the most powerful nuclear weapon ever detonated. Its test on October 30, 1961 remains the most powerful human-made explosion in history.