Russian Army special forces invaded this town last week. There is video and signal intel that proves it. The Russians raided the local armory and then set up their stooges. The Russians are to blame for anything that happens now as a result of their terrorist attacks in this town.
However, Russian military planners are almost certainly advising Vladimir Putin that, although an incursion with a strictly limited objective against weak defences might easily be achieved, occupying a large tract of land against the wishes of most of the people who live there is far harder. Getting bogged down and exposed to attacks by Ukrainian irregular forces would be all too likely. Stationing lots of troops in Ukraine indefinitely would have ramifications elsewhere, stretching forces in volatile regions such as the north Caucasus and Central Asia. On top of this, Mr Putin cannot be entirely confident about how his forces would perform. Their post-Georgia modernisation is a work in progress, with poor command and control and logistics hampered by incompatible equipment.
According to a recent biography of Mr Putin, one of his first KGB instructors complained that he had “a lowered sense of danger”. Faced with a decision to send his forces into Ukraine or stand them down, it is possible that not even he yet knows which he will choose. http://www.economist.com/news/briefing/21601050-russia-would-find-holding-territory-ukraine-harder-taking-it-gathering-storm?fsrc=scn/tw/te/pe/gatheringstorm