Because there was no true defense against nuclear weapons. Once both sides had nuclear weapons, the only way to "protect" themselves from the other side was to have so many more nuclear weapons that even if their enemies used all of their nuclear weapons, there would still be nuclear weapons to shoot back with. That way, nobody would use nuclear weapons, because they could never actually "win" that way. This thought process was referred to as Mutually Assured Destruction, or MAD.
Announced US Policy, diected at the Soviet Union, that declared that the US could or would respond with the maximum number of nuclear weapons, if the United States (or key allies) was attacked with one or more nuclear weapons from the Soviet Union or any of its allies. It was designed to deter the Soviets from the use of nuclear weapons.
Project 'Manhattan' or to simply say, Nuclear Bombs and the US "Red Scare" in the early 1950s. from then on every country wanted nuclear weapons, And the First to acquire was the US, then Russia, then the United Kingdom, then France, then China, then India, then Pakistan, then North Korea. It is believed that Israel also has them, but they refuse to either confirm or deny. At the peak of the cold war arms race both the US and Russia had more than 10,000 strategic nuclear weapons and roughly 50,000 tactical nuclear weapons each, no other country in the world has ever had more than a few hundred total strategic and tactical nuclear weapons. As of 2014 both the US and Russia have reduced their stockpiles to about 3000 strategic nuclear weapons and zero tactical nuclear weapons (however the US maintains the parts from the dismantled 7000 strategic nuclear weapons and in an emergency could still reassemble them in a few months time into usable weapons, Russia likely has similar ability).
Nuclear weapons serve as a deterrent. One country will be less likely to attack another that it knows has nuclear capability because of the destruction that could be wrought by nuclear weapons. This theory is called MAD or Mutually Assured Destruction, meaning that both sides would destroy each other so utterly by going to war that peace (even bitter cold peace) is the only viable option. Biological and Chemical weapons, which are also called weapons of mass destruction, do not have this deterrent effect.
Nearly every kind that anyone could think up.
Although they have the nuclear material that could be deviated for nuclear weapon production but Ukraine has neither the motivation nor the political/economical will to make nuclear weapons.
They could construct nuclear weapons.
Without nuclear weapons, another nation with nuclear weapons could launch an attack without worry of a retaliation. There are not that many ways of diverting a long-range ballistic missile.
At this point in time (2012) Iran is believed to have no nuclear weapons capability at all. However this could end at any time (at which point Iran would be nuclear weapons capable).
At any time Russia could have blew us up with nuclear weapons
While nuclear weapons have the potential to cause massive destruction, it is unlikely that they could destroy the entire world. However, a large-scale nuclear war could have catastrophic consequences for civilization, causing widespread devastation, loss of life, and long-term environmental impacts. Efforts to prevent the use of nuclear weapons are crucial for global security and peace.
Because there was no true defense against nuclear weapons. Once both sides had nuclear weapons, the only way to "protect" themselves from the other side was to have so many more nuclear weapons that even if their enemies used all of their nuclear weapons, there would still be nuclear weapons to shoot back with. That way, nobody would use nuclear weapons, because they could never actually "win" that way. This thought process was referred to as Mutually Assured Destruction, or MAD.
Because nuclear weapons are the most deadly of all weapons and can kill hundreds of thousands of people at once. Also, people will always get suspicious if a country is secretly making nuclear weapons e.g. Iran and USA. IF one country wants to build nuclear weapons then their neigh ours would want to too
Because the nuclear weapons were missiles that could be deployed to the United States. And they were getting ready to launch them. this is lies
Not that any one is willing to admit to. But there may well be US nuclear weapons stationed in italy. The countries with nuclear weapons capabilities are the USA, Russian Federation, Great Britain, France, Israel, India, Pakistan, and N. Korea. Countries that formerly had nuclear weapons included Belarus, Kazakhstan, Ukraine, and South Africa. Countries that could have weapons or programs include Iran and Syria. Iraq was accused of have nuclear weapons but likely never got beyond the conceptual program stage although it did acquire nuclear material. Quite a few other countries do have (or had) nuclear research or power generating capabilities. They include Argentina, Armenia, Belgium, Brazil, Bulgaria, Canada, China, Czech Republic, Finland, France, Germany, Hungary, India, Iran, Iraq, Japan, Mexico, N. Korea, Netherlands, Pakistan, Romania, Russian Federation, Slovakian Republic, Slovenia, S. Africa, S. Korea, Spain, Sweden, Switzerland, Syria, Taiwan, Ukraine, United Kingdom, and the USA.
The only country with nuclear weapons who can dare to start a nuclear war is Pakistan coz they have no brains
Most world religions dislike nuclear bombs because they cause so much destruction.