Russia, U.S. Agree to New Syria Ceasefire.
BLITZER: President Obama spoke with Russian President Vladimir Putin today, hoping to solidify a new cease-fire in the Syria's bloody civil war. Syrian civilians are living under constant bombardment and many are on the verge of starvation as aid groups struggle to reach war-torn cities. Our Pentagon correspondent Barbara Starr is tracking the late-breaking developments for us. What are you learning, Barbara?</s>BARBARA STARR, CNN PENTAGON CORRESPONDENT: Good evening, Wolf. Well, a cease-fire may well be in the works, but there's a long way to go to make it really happened. We want to warn our viewers. Some of the scenes you're about to see are very graphic.</s>STARR (voice-over): Suicide bombers striking in Damascus, the Syrian capital. Scores killed, nearly 200 wounded. And a massive bomb attack in Homs where the Assad regime is supposed to be in control. ISIS claimed responsibility for the devastation. Now, the U.S. and Russia announcing a plan for a cease-fire, but not with ISIS. President Obama and Russian President Vladimir Putin spoke on the telephone about the agreement scheduled to go into effect this weekend. Questions already about how secure the deal is. The U.S. warning it may be tough to get all sides to adhere to the agreement.</s>MARK TONER, STATE DEPARTMENT DEPUTY SPOKESMAN: You can't just flip a switch, it is going to take a little bit of time for us to actually implement it.</s>STARR: And an extraordinary admission on how the U.S. will keep tabs on the agreement in part by watching aid groups.</s>TONER: There's not going to be any monitors on the ground to look at this other than where we get information from in terms of intelligence but also through NGOs reporting on the ground and journalists, frankly, who get feedback as to who is being hit by whom.</s>STARR: At stake, the immediate fate of tens of thousands of Syrian civilians bombed by Russia and the Syrian regime, starving and lacking medical care. Russia currently is dropping about 100 bombs a day, claiming it's bombing ISIS. The U.S. says Moscow is bombing civilians and Bashar al Assad's opposition forces with help from Iran and the regime.</s>JOHN KERRY, SECRETARY OF STATE: Russia has to talk with Iran and with the Syrian regime, and we have to talk with the opposition.</s>STARR: Putin saying he will get his side on board.</s>VLADIMIR PUTIN, RUSSIAN PRESIDENT (through translator): We will do whatever is necessary with Damascus, with the legitimate Syrian authorities.</s>STARR: Assad told the Spanish newspaper he definitely supports the deal, but warns that could change if others try to improve their battlefield positions. ISIS and al Qaeda are not party to the agreement. U.S. airstrikes against ISIS will continue and nobody expects ISIS to stop its attacks.</s>STARR: And while all of this is going on, the U.S. is still keeping a very sharp eye on Libya in North Africa. The estimate there now in terms of ISIS' strength, Wolf, the U.S. believes there could be somewhere between 5,000 and 6,500 ISIS fighters in Libya. They are tracking ISIS camps across that country now, Wolf.</s>BLITZER: Libya becoming a major base for ISIS right now. What else are you learning about these foreign fighters in Libya?</s>STARR: Well, I talk to U.S. officials today who said they believe right now that ISIS is recruiting inside Libya. They are recruiting fighters from other places in Africa. They are recruiting fighters essentially who have tried to go into Syria through Turkey, but can't get into Syria. So, they're diverting them to Libya. And ISIS fighters on the run from airstrikes in Syria and Iraq. Libya very much a new front for ISIS, a big worry for the Obama administration, Wolf.</s>BLITZER: Clearly, it looks like it has become for all practical purposes a failed state. All right. Barbara, thanks very much for that. That's it for me. Thanks very much for watching. "ERIN BURNETT OUTFRONT" starts right now.