The "second" site is a decoy for IAEA. By allowing inspectors into this so-called "second" site - Iran will deflect the pressure and gain time, even as it makes sure that Obama's initiatives go nowhere. Israeli settlers have demonstrated how easy it is to make Obama work hard and get nowhere.
U.S. says working on initiative to de-escalate Syria fighting, with focus on Aleppo (Reuters)
from the article: Obama: We'll mull 'sanctions that bite' if Iran nuclear talks fail