Earlier quoted context omitted.
Problem with your argument is, the last thing Russia wants is more sanctions, precisely because of it's currently collapsing economy. People are not happy and it is 2017, exactly a century since the Great October Revolution of 1917. This severely limits them in search of external enemies.
I'm not that worried about 2017, but where Russia is heading in the medium term. But even this year, they seem to be willing to continue to wage war in Ukraine, and with Belarus in turmoil, they may feel they have to send in some tanks to defend the friendly Lukashenko regime.
Ukrainian regime actually does not want the war to end. The oligarchs there are very much OK with plundering the country while playing the external enemy card. If war stopped the population would turn their attention inward and they have nothing to show for their time in power.