Oko

• abstract: Oko ( meaning Eye in old Russian),also known as SPRN ( from спутник для предупреждения о ракетном нападении meaning satellite for warning on rocket attack) according to one source, but SPRN is more commonly used to describe the whole early warning system, система предупреждения о ракетном нападении (system of missile warning), which includes Oko but also includes early warning radar. is a Russian (previously Soviet) missile defence early warning programme consisting of satellites in Molniya and geosynchronous orbits.

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