The right president might make some real improvements in relations with Russia. This is probably a goodwill gesture from Vladimir, just in case.
Ol Vlad is a master deception and at playing people. Trump best tread carefully otherwise may get a lesson in getting played like a cheap fiddle.
remember in the first debate the moderator and Jeb bush tried to goad Trump into calling Putin a thug and trump told the audience that he was not going there because calling Putin a thug could possibly make it hard in the future for him when having to deal with Russia. I think that Putin saw that as a signal that if trump got into power that they could come to some understanding on issues of mutual concern.