Obama would be right not to fight , the risks outweigh the benefits ( what benefits ? ) , Ukraine really has nothing to offer for what an escalation would produce long term . Better to sit this one out , and let the cards fall where they may . I dont think Putin wants more than those areas that are in conflict , not that he’s a good guy or anything like that , but those areas also held an election and are attempting to become independent from Ukraine , supporting that by backing them up with Russian troops , would be a quasi legitimate reason to go in , as they are pro Russian . He also knows that Ukraine is now an independent nation and going into Ukraine proper would cause a serious reaction . I think he will stop there . This seems to be more an ethnic and political situation , than a territorial land grab . Look at it this way , if the separatists were pro west , and wanted independence , we would be supporting the break up ……………..but because they are not , we call them terrorists . Just Sayin .