On 10 July 2017, at 20:14 MSK (17:14 UTC) the Air and Space Forces successfully launched a Soyuz-2.1v launcher from the pad No. 4 of the site No. 43 of the Plesetsk launch site. The Volga booster successfully released four small satellites - Cosmos-2535, Cosmos-2536, Cosmos-2537, and Cosmos-2538. According to the ministry of defense statement, the satellites' mission is to study the effect of natural and artificial factors of space on satellites operated by Russia and to calibrate radars operated by the Air and Space Forces.

The satellites received international designations 2019-039A to 2019-039D and NORAD numbers 44421 to 44424.

Two satellites - Cosmos-2535 and Cosmos-2536 - later conducted a series of proximity maneuvers. It appears that these are objects 2019-039A/44421 and 2019-039D/44424.

This is not the first time Russia announces a launch of a satellite-inspector. In August 2017 the ministry of defense disclosed that Cosmos-2521 is a satellite-inspector launched in June 2017 along with Cosmos-2519. See a discussion of the program at the RussianSpaceWeb site.