Like Dr. Strangelove said in the movie. The entire purpose of the Dooms Day Machine is to instill the fear to attack; Why didnt you tell the world
As you may remember, the attack by the rogue US general is expected to set off a Soviet doomsday machine. It results in the following conversation:
Ambassador de Sadesky: It was to be announced at the Party Congress on Monday. As you know, the Premier loves surprises.
Much nicer and more effective in the original B/W.