This is all fairly straight forward:
Turkey supports ISIS, so does Obama by minimizing his bombing efforts, Its all about the Sunni Cause. Russia supports the SHiites and Iran. Obama gives Erdogan the word...and down goes a Russian jet. The whole situation, including the security interests of the USA is being managed by the Saudis.
Putin knows all of this, and will likely make sure that Obama receives some incoming.
http://www.freerepublic.com/focus/news/3365868/posts?page=11#11
He’s running for cover already. Being the tail that wags zero’s ambitions isn’t worth the consequences.