AdvertisementBuried In Trump's Nuclear Report: A Russian Doomsday WeaponFebruary 02, 2018Geoff BrumfielfacebookEmailOn March 1, 1954, the U.S. conducted its largest nuclear test with a yield of 15 megatons. The new Russian weapon would be up to 100 megatons, according to reports. (USAF Lookout Moutain Laboratory)