Obama will launch massive cruise Missile attacks on any nuclear sites above ground. If Frodow has indeed been taken out, these two acts would effectively nueter Iran. Obama has no choice, failure to do so would mean a nuclear arms race in the Middle East which would be a dissaster for humanity!
47 killed in clashes between ISIS, Syrian rebels near Turkey border, monitor says (Reuters)
from the article: Kerry: Major powers ready to respond if Iran addresses nuclear concerns