https://www.quora.com/What-is-the-largest-war-machine-that-humanity-has-ever-built-and-for-what-purposeAnd the most dangerous Nuke which could alone wipe the whole world
https://en.wikipedia.org/wiki/Tsar_BombaActually russia have a missile through which they can combine all their nukes together and dooms day but i dont remeber the link