In the late 1980s it peaked at somewhere over 20,000 warheads. As of 2012 the total has declined to roughly 10,000 warheads.
Neither the US nor Russia are making nuclear weapons of any kind at this time. Other countries however are making nuclear weapons; some are North Korea, India, and Pakistan.
The atomic bombs dropped on Hiroshima and Nagasaki in 1945 had yields of about 15 and 20 kilotons of TNT, respectively, resulting in immense destruction and loss of life. In contrast, modern nuclear bombs are significantly more powerful, with megaton yields that can cause widespread devastation over much larger areas. Additionally, advancements in delivery systems, precision targeting, and the development of thermonuclear weapons (hydrogen bombs) have greatly increased their destructive capacity and strategic complexity. Overall, while the fundamental principles of nuclear fission remain the same, the scale and implications of nuclear weapons today are far more profound.
Nuclear bombs before the 60s were referred to as atom bombs, because the term Nuclear hadn't been discover yet. Nuclear bombs today, are generally Hydrogen bombs, or fusion bombs. They are significantly more powerful, able to places about the size of Rhode Island. Atom bombs,which were mostly uranium and plutonium, lack the destructive power of Nuclear or Fusion bombs.
Atomic bombs have not been used in warfare since 1945. Nations have an arms control agreement called the Non-Proliferation Treaty to prevent the spread of nuclear weapons, and most countries have committed to not use atomic bombs. However, some countries still possess these weapons as a deterrent.
Atomic bombs (and all nuclear weapons) are not actually used in the sense that a country actually drops/fires/launches a nuclear weapon against a foe. Their massive destructive potential has caused them to be moved from a purely military device into the political arena. Nuclear weapons today are political tools - that is, the possession (or implied attempt to possess) these weapons is considered a political statement, rather than a military one. As such, the quantity, location, and capabilities of a country's nuclear weapons take on significant political meaning. The ability to potentially use such weapons adds a completely new dimension to international relations. Primarily, nuclear weaponry is used for three purposes: to discourage the use of any Weapon of Mass Destruction (nuclear, chemical, biological, toxin, etc.) by threat of immediate retaliation via nuclear arms, as a moderating influence on aggression by other nuclear-equipped countries, and as a brake (via implied threat) on non-nuclear countries attempts to acquire nuclear weaponry themselves. The second of the above has been the most successful political use, while the first has seen modest success as a strategy, and the third is mostly a failure.
Russia started testing and constructing nuclear, and atomic bombs at the end of WW2. today, they own more the 4000 operational nuclear warheads. along with a total 12000 in storage.
Uranium is used as nuclear fuel in nuclear reactor.France and United Kingdom use also uranium for nuclear weapons (but today bombs are generally with plutonium or thermonuclear).
There have not been any attacks using atomic bombs or missiles since World War II (as of today, May 4th, 2011). There have however, been many nuclear weapons tests - where controlled explosions have been conducted. Most of these have occurred underground to reduce nuclear fallout.
Many countries have nuclear weapons today including the United States. China, North Korea, South Korea, and Japan also have nuclear weapons.
Answer by an editor: No one wants to use an atomic weapon, particularly the nuclear missiles we have now in the world. The weapons of today can destroy 1/3 of the world so they are not fired.
Today, if any country decided to send a missile over to our country, we would know via satellite that they had fired (in a matter of mere seconds). By knowing they are sending a nuclear bomb to our country, we would fire one them. This would mean a nuclear fallout; our bombs are at least thirty times stronger than the bombs released at Hiroshima and Nagasaki in 1945. This keeps any country from using nuclear weapons on each other for fear of nuclear fallout.
Iron bombs are used today to separate them from atomic/flame/and smart bombs. During WW1 & WW2 there was only a need to use the terms fire bombs or general purpose bombs (High Explosive). During the Korean War, we had to separate the atomic bomb from fire bombs and general purpose bombs. During the Vietnam War, the same separations had to be termed. By the end of the Vietnam War in 1975, SMART Weapons had to be added to the ATOMIC, FIRE, GENERAL PURPOSE bombs...so the accepted term for General Purpose (High Explosive) bombs came to be known as IRON BOMBS; aka Dumb Bombs.