The country 's first nuclear test in 1945, the last in 1992. In total , the U.S. has conducted about 1,054 trials and now has 7,650 nuclear warheads.
The United States has conducted a nuclear test in the world's most widely. He is also the only country that deploy nuclear weapons in other countries. Through a program of nuclear cooperation with NATO, U.S. nuclear stationed in Belgium, Germany, Italy, the Netherlands and Turkey.
Through various agreements, the United States and the former nemesis, Russia, promises to both reduce their nuclear arsenals. Both countries have the same ability to launch nuclear weapons by land, air, and sea.
Russia
The country tested its first in 1949, four years after its main rival, the U.S. .Recent tests conducted in 1990. Russia to test as many as 715 times, and is estimated to have 8,420 nuclear warheads.
When the first Soviet atomic bomb test in 1949, they used a design similar to the U.S. bombs were tested four the previous year as well as the bomb that was detonated over Nagasaki, Japan.
English
The first nuclear test in 1952, the last in 1991. Countries led by David Cameron is doing 45 trials and is now estimated to have 225 nuclear warheads.
When the United States started the project of making bombs ( known as the Manhattan Project ), a group of scientists known as the "Mission UK" arrived to help. However, when the United States passed a law in 1946 that states share information about the atomic bomb to another state is illegal, Britain launch its own nuclear program. U.S. law was amended in 1954 so that the collaboration between the two countries could re- occur. Over half of the UK 's nuclear test was a joint operation with the United States.
French
This country is more delayed than its allies, the U.S. and the UK, the nuclear test. The first trial was conducted in 1960, the latest year 1996. In total, France perform 210 trials and is believed to have 300 nuclear warheads.
After the review of defense by President Jacques Chirac, France unload land-based nuclear weapons in 1996 and reduced the total number of release tool as much as 50 percent. Currently most of the 300 nuclear warheads stationed at four nuclear submarines. The rest are placed on the plane, in the maintenance, or wait for demolition, said the Federation of American Scientists.
China
China 's first nuclear trials conducted in 1964, most recently in 1996. China did as many as 45 nuclear test, and now has 240 nuclear warheads.
China began to build a nuclear weapon in 1950 after the U.S. moved its nuclear assets to the Pacific during the Korean War. Once successfully tested its first nuclear device, China conducted its first thermonuclear test 32 months later - the shortest time between fission and fusion tests of all the world 's nuclear powers.
According to the Federation of American Scientists, China continues to add to its arsenal. In December 2012, the country is estimated to have approximately 140 warheads stationed on land-based missiles and 40 warheads were placed for the aircraft. The rest awaiting demolition or stored for nuclear submarines in the future.
India
India conducted the first nuclear test in 1974, the latest 1998. India conducted six nuclear tests and is believed to have 80-100 nuclear warheads.
India decided to build their nuclear weapons after China began to carry out a nuclear test in the mid-1960s. India tested its first nuclear device in 1974. The country has aircraft and missiles capable of carrying nuclear, and seemed to add assets in the navy for its nuclear program. Unlike rivals, Pakistan, India is actively working to produce more nuclear warheads, said the Federation of American Scientists.
Pakistan
Pakistani nuclear first trial conducted in 1998, the latest 1998. At least after six trials, Pakistan is believed to have 90-110 nuclear warheads.
In 1972, after three wars with India, Pakistan quietly decided to start a nuclear program to offset India. Such as India, Pakistan is actively working to produce more warheads, according to the Federation of American Scientists. Pakistan has the capability to launch nuclear missiles through the air and ground-based. Pakistan reportedly has not had a sea -based launch mechanism.
North Korea
First test of a nuclear North Korea conducted in 2006, the latest year. Tests performed three times and is believed to have fewer than 10 nuclear warheads.
North Korea's nuclear program began with the installation of Soviet reactor at Yongbyon. In a 1994 agreement with the United States, North Korea agreed to halt its nuclear weapons program in exchange for a reactor to produce electricity. Eight years later, Pyongyang admitted having a secret nuclear weapons program and expelled inspectors from the International Atomic Energy Agency, the UN nuclear watchdog. The UN Security Council has issued new sanctions against North Korea after each nuclear test.
Israel
Israel refuses to confirm or deny the widespread belief that it has nuclear. However, the Federation of American Scientists estimates that the country has about 80 nuclear weapons and has enough plutonium to make as many as 200 nuclear weapons.
Former Prime Minister Shimon Peres, in a 1998 television interview, said Israel began to develop a " nuclear option " in 1950 to prevent war. The center of the Israeli weapons program reportedly in the Negev Nuclear Research Center near the desert town of Dimona.
Over the years, Israel has acquired submarines and aircraft capable of carrying nuclear warheads. However, Israel does not confirm whether they have been modified for nuclear launches. Many have predicted that Israel's Jericho missiles also have the ability to carry a nuclear warhead.
Iran
Over the last decade there is worldwide concern over Iran's nuclear program.
Iran stated that it will enrich uranium reactor for civilian energy purposes only. However, the IAEA said Iran has not cooperated sufficiently with the agency to verify if the aim is solely for civilian purposes. As a result, the UN Security Council and a number of Western nations impose economic sanctions and embargo on the country.
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