Cosmos 2519, 2521 and 2523

Cosmos 2521 has been released by the Cosmos 2519 satellite. It should be used for inspections in the orbit where it is located. After being separated from the first satellite, he in turn released another satellite, Cosmos 2523.

Cosmos 2523 was separated from Cosmos 2521 shortly after the launch, we do not know its usefulness.

Cosmos 2519 is a military satellite whose use is unknown. He released some time after launching a second satellite, Cosmos 2521.