I'm not sure who this is trying to convince. People who agree with him like me, it probably won't affect much. People who want to invade Syria are the type of people that will see his name and only feel vindicated in their belief. You know Fox News, et al. will spam their viewers with "This is what Putin says, it must be wrong."
I don't know if there is really a lot of people sitting on the fence on this one, other than the apathetic who won't read it anyway.