Obama's real negotiations goal : keep Iran from getting nuclear bomb or prevent Israel from attacking Iran?

I don't see any evidence Obama has ever been serious about keeping Iran from getting a nuclear bomb. If the negotiations play out as currently expected, they will lift economic sanctions on Iran and leave Iran only weeks away from getting a nuclear weapon anytime it desires to have one. I believe Obama's real purpose in negotiating has been to block an Israeli air attack on the Iran nuclear program. I think Obama would rather have Iran get a nuclear bomb than have Israel launch an air attack on Iran. In the magazine article this week Obama's aide bragged about the Obama administration obstructing Israel from attacking Iran, even though that is leading to an Iranian nuclear bomb.