Such maneuvering capability is consistent with, but not necessarily indicative of, an on-orbit anti-satellite weapon. [see SpaceNews.com link below]
According to Gunter’s Space Page, the potential anti-satellite weapon is likely part of the COSPAR 2015-020D launch that included Kosmos 2491, 2499, and 2504 (RS 46, 47) on March 15, 2015. A month after launch, Kosmos 2504 began maneuvering as an orbital inspector. Kosmos 2491 is in a 1482 km × 1507 km, 82.4° orbit, and Kosmos 2499 is in a 1479 km × 1508 km, 82.4° orbit.
- See more at: http://spacenews.com/maneuvering-russian-satellite-has-everyones-attention/?utm_content=bufferb9fd0&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer#sthash.ngFaAbvh.dpuf
- See more at: http://space.skyrocket.de/doc_sdat/kosmos-2491.htm