Trump want best for American people same as Putin for Russians and whole world would become better place if USA and Russia have better communication and cooperation. Just saying, not that i think you know what you are talking about.
Putin does not want another World War right now. If Hillary Clinton becomes the POTUS in 2016, a war win Iran is more or less certain to occur. So he is putting his weight behind Trump, who seems to be the best alternative to Billary right now. Unlike Hillary, Marco Rubio, and Jeb Bush, Donald Trump seems less of a warmonger.