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The US and Russia both have formidable arsenals of potentially destructive nuclear weapons. Although a nuclear-free world remains a distant dream, the two countries have taken steps to limit the risk of nuclear conflict, through a series of arms control agreements limiting the number of strategic weapons that each can have. In force since 2011, the New Strategic Arms Reductions Treaty (New START) is the latest of these agreements. Under New START, Russia and the US are limited to an equal number ...

Nuclear weapons and ballistic missiles need to be understood if the risks and challenges they entail are to be grasped. This understanding starts with two processes discovered in the last century – nuclear fission and nuclear fusion – that have the ability to release a significant quantity of energy from a very limited amount of matter. On the one hand, these reactions can be used to produce energy. Controlled nuclear fission is the process on which nuclear power plants are based. Nuclear fusion, ...