A bombing campaign in support of rebels and butchers isn't as bad as "rolling in with tanks"?.
Whatever.
Nothing happened in Syria, ironically, thanks to Putin. Serbia and Libya indeed were extremely ill-advised, but in both cases there was an armed conflict going on before we got involved. In the case of Ukraine Putin simply wants to redraw national borders that RF itself had guaranteed, because he feels like it. Also, it is not just a military operation like, for example, the war in Osetia was. It is a complete realignment of RF into a Sovietized political system: the parliament voting to support the leader 100%, celebrities writing chauvinistic open letters, people with dissident opinions fired from their jobs, government overseers are installed at the news organizations; the whole nation is in a Cold War hysteria. The progress toward pluralism and rule of law in RF of the past 20 years has been reversed and if Putin and his circle remain in power for another year or so, we'll have the transition to USSR 2.0 complete.