Considering that US recently cancelled negotiations with him on Syria issues it looks quite interesting. Basically, he's showing that he's wants new negotiations.
Putin clearly demonstrated in recent years that for him process of negotiations and all this hassle with Americans on the global stage is more important than solving issues on the table. Basically for him longer it lasts the better. Americans realized it long time ago, but only recently started to be practical about it. They started to do the worst! They started to ignore him. And I think it is right thing to do. As one the main rules of internet says: "Don't feed the trolls!".
Biggest problem though, it is absolutely impossible to say what Putin's reaction will be.