The US launched the first SIGINT satellites, followed by the Soviets. Recently, however, the French have been launching intelligence satellites, on French and Russian rockets, and are exchanging information with the Germans and Italians, both of which are deploying synthetic aperture radar MASINT constellations, with an undefined IMINT or electro-optical MASINT capability on the Italian satellites.
Additional nations have launched IMINT satellites; SIGINT seems to be a lesser priority, with radar MASINT often a higher priority. There are a number of bilateral agreements for satellite cost and intelligence sharing.
Read more about this topic: Signals Intelligence Operational Platforms By Nation
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