Their military is more of an organized crime family, and not so much of a professional military. Every corner of Russia is corrupt under Putin. They've all been getting rich at his discretion. Better to lay low and hope for the best. I've posted this before, Putin is reportedly worth billions that came from his cut. Many people don't believe this. They think he will never leave Russia willingly, and his interest is directing the graft throughout Russia, and being paid back in loyalty.
Answered already, but as to your first post on this page, the FSB has millions of operatives, and makes people disappear into prisons. Think of Alexei Navalny. That has been repeated thousands of times over.