Because Clinton promises a war against Syria and Russia whereas Trump promised a hand of friendship and ally with Assad to fight the terrorism in the Middle East. Trump sounds considerate and sane. Who do you think would Russians to prefer?
It is resonable, it is what Russian Media says, in including Putin himself. But, this is not acceptable reason, right? Russians must have a cunning plan. You cannot, but Russians certainly have it and we must silence the outright reason. We must ascribe our reasons to Russians. This way, we can be more efficient to combat their cunning plan. It is always easier to demonize the enemy by not letting them speak and ascribing our dirty insinuations to em.