Putin told him if he bombed, his background and birthplace would be revealed to the world. That’s why you can’t have a president with a sealed background and a press that thinks it’s ok. He’s being blackmailed, in my opinion, like he blackmails his opposition here in the USA, only with him, it’s much worse.
Obama obsesses over being blackmailed himself, which is why he keeps his past so secret. By this, he clearly shows that he understands the blackmail game. I have no doubt that he and his thugs employ this technique at every opportunity against their political adversaries.