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In page Nuclear electromagnetic pulse:

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The Soviet Union designed a system to deliver nuclear weapons from the low Earth orbit.[1] and proposals have been made by Russia to develop satellites supplied with EMP capabilities[citation needed]. This would call for detonations up to 100 kilometres (62 mi) above the Earth's surface, with the potential to disrupt the electronic systems of U.S. satellites suspended in orbit around the planet, many of which are vital for deterrence and alerting the country of possible incoming missiles.[2]