Of course it is *IF* the Russians were somehow able to lower or raise their satellite's orbit. They *may* have selected this particular satellite (COSMOS 2215) precisely because its orbit could potentially intersect with the U.S. (Iridium) satellite's over Siberia where they could more easily monitor a collision (if the altitude was 'adjusted' just right). However, based on an excerpt I followed up with from the Space.com article, the Russian satellite was apparently 'non-maneuverable'. But I don't buy that quite yet.
Which they apparently could not.
You're making this way too complicated. An accidental collision is a far more plausible explanation for what happened.