Nuclear Notebook: How many nuclear bombs does Pakistan have? Pakistan continues to expand its nuclear arsenal and is growing its fissile materials production industry. Since our last Nuclear Notebook on the country in 2011 (Kristensen and Norris, 2011), it has deployed two new nuclear-capable short-range ballistic missiles (SRBM) and a new medium-range ballistic missile (MRBM), … Continued

Nuclear Notebook: How many nuclear warheads does India have? India’s drive to develop a nuclear triad reached an important milestone in 2014 with the first nuclear-powered ballistic missile submarine deploying on its initial, brief, sea-trial voyage. Now, with several long-range ballistic missiles in development, the Indian nuclear posture is entering an important and dynamic new … Continued

Nuclear Notebook: How many nuclear bombs does China have? We estimate that China has approximately 260 nuclear warheads in its stockpile for delivery by approximately 160 land-based ballistic missiles as well as aircraft1 and an emerging ballistic submarine fleet. This estimate is 10 warheads higher than last year, primarily due to additional sea-launched ballistic missiles. … Continued

Nuclear Notebook: How many nuclear bombs does Russia have? Russia is in the middle of a broad modernization of its strategic and nonstrategic nuclear forces. While much of this process continues well-known programs that have been under way for many years, some developments are new. Combined, the steps Moscow is taking contribute to growing concern … Continued

Nuclear Notebook: How many nuclear weapons does the US have? At the beginning of 2015, the US Defense Department maintained a stockpile of an estimated 4,760 nuclear warheads for delivery by more than 800 ballistic missiles and aircraft. The stockpile did not shrink significantly over the last year, but has shrunk by roughly 350 warheads … Continued

Nuclear Notebook: How many nuclear weapons exist in the world? Longtime Nuclear Notebook readers know that we typically take an in-depth look at arsenals around the world to reveal, as much as possible, what kind of nuclear weapons are deployed, where they are, and in what numbers. In this issue of the Bulletin of the … Continued

Nuclear Notebook: How many nuclear weapons does Israel have? Although the Israeli government neither confirms nor denies that it possesses nuclear weapons, it is generally accepted by friend and foe alike that Israel is a nuclear-armed state—and has been so for nearly half a century. The basis for this conclusion has been strengthened significantly since … Continued

Nuclear Notebook: How many nuclear weapons are there in the world? As of mid-2014, the authors estimate that there are approximately 16,300 nuclear weapons located at some 98 sites in 14 countries. Roughly 10,000 of these weapons are in military arsenals; the remaining weapons are retired and awaiting dismantlement. Approximately 4,000 are operationally available, and … Continued

Nuclear Notebook: Nuclear Non-Proliferation Treaty (NPT) Every five years the parties to the Nuclear Non-Proliferation Treaty (NPT) gather in New York to review progress and challenges related to the treaty. Every time, the five nuclear weapons states and permanent members of the United Nations Security Council, their non-nuclear allies, and the non-aligned non-nuclear countries that … Continued

Nuclear Notebook: B61 nuclear bomb upgrade and history The Obama administration has approved an upgrade to the B61 nuclear bomb that will, through use of a new tail kit assembly, become a guided standoff nuclear bomb. If the upgrade—the 12th modification of the original B61 design—is pursued as planned, the US Air Force will obtain … Continued

Nuclear Notebook: How many nuclear weapons does Russia have? Since our last Russian Notebook in early 2013, Russia has taken several important steps in modernizing its strategic and nonstrategic nuclear forces. These include continued development and deployment of new intercontinental ballistic missiles (ICBMs), construction of ballistic missile submarines, development of a new strategic bomber, and … Continued

Nuclear Notebook: How many nuclear bombs does the US have? The US Defense Department maintains a stockpile of an estimated 4,650 nuclear warheads for delivery by more than 800 ballistic missiles and aircraft. The stockpile did not decline significantly over the last year, but has shrunk by roughly 460 warheads compared with May 2010, when … Continued

Nuclear Notebook: How many nuclear bombs does China have? China has a nuclear weapons modernization program under way that involves upgrading its nuclear-capable land-, sea-, and air-based delivery vehicles. The size of the nuclear arsenal is increasing, though at a slow rate. We estimate that China has approximately 250 warheads in its stockpile for delivery … Continued

Nuclear Notebook: How many nuclear weapons exist on earth? The authors calculate that some 125,000 nuclear warheads have been built since 1945, about 97 percent of them by the United States and the Soviet Union and Russia. The nine nations with nuclear weapons now possess more than 10,000 nuclear warheads in their military stockpiles, the … Continued

Nuclear Notebook: How many nuclear weapons does Britain have? Recent research has revealed new facts about the British nuclear arsenal over a 25-year period starting in 1953. This accounting and the authors’ own research support an estimate that the British produced about 1,250 nuclear warheads between 1953 and 2013. From a peak of about 500 … Continued

Nuclear Notebook: How many nuclear weapons does Russia have? Russia is in the middle of a comprehensive modernization of its nuclear forces that began more than a decade ago. The upgrade, which involves replacing all Soviet-era ballistic missiles with fewer improved missiles, is now approaching a point at which the number of modern weapons will … Continued

Nuclear Notebook: How many nuclear weapons does the United States have? The US Defense Department maintains a stockpile of an estimated 4,650 nuclear warheads for delivery by more than 800 ballistic missiles and aircraft. Compared with last year, that is a reduction of approximately 260 warheads due to the retirement of W80-0 warheads for the … Continued

Nuclear Notebook: How many nuclear weapons the countries India, Israel, North Korea, Pakistan, and South Africa have? Over the past decade, a number of governments around the world have begun to declassify more information on their nuclear weapons programs—Brazil, India, China, and South Africa, to name a few. Though this progress is patchy, and could … Continued

Nuclear Notebook: How many nuclear weapons were operational during the Cuban Missile Crisis? There is little argument that October 1962—the Cuban Missile Crisis—marked the closest the world has come to nuclear war. Today, 50 years later, volumes have been written about the crisis. Even so, in the tens of thousands of pages that interpret and … Continued

Nuclear Notebook: How many nonstrategic nuclear weapons do Russia, the United States, France, Pakistan, and China have? After two decades of neglect, nonstrategic nuclear weapons are receiving new attention, with the United States and NATO seeking an agreement with Russia on reducing inventories and increasing transparency. At the same time, newer nuclear weapon states are … Continued