What is a nuclear warhead? What if North Korea nuked the US? The only countries known to have exploded nuclear weapons - and recognize their possessions - are (chronologically according to the date of the first test) the United States, the Soviet Union (successively as nuclear power by Russia), the United Kingdom, France and China, India, Pakistan and North Korea. With regard to weapons of mass destruction, the proliferation of nuclear weapons is at the center of international relations policy. Weapons whose explosive production comes exclusively from fission reactions are commonly referred to as atomic bombs or atomic bombs (abbreviated as A bombs). The hypothesis of climatology is that if every city were leaking, soot could be projected into the atmosphere that could cover the earth, cutting off the sunlight for years, causing the disruption of food chains, what is called a nuclear winter. 2 A nuclear device no larger than traditional bombs can devastate an entire city by blast, fi