Russian Strikes on Syrian Rebels Caught on Video.
BLITZER: CNN has obtained exclusive images of Russian strikes on Syrian rebels trying to oust President Bashar al-Assad whose embattled regime is now being propped up by Vladimir Putin. And with the help of Russian warplanes and cruise missiles, Assad's forces are making critical gains right now. Our senior international correspondent Nick Paton Walsh is right near the Turkish-Syrian. Nick is joining us live. Nick, these are some very dramatic images. Tell us about them.</s>NICK PATON WALSH, CNN SENIOR INTERNATIONAL CORRESPONDENT: Probably some of the most substantial change of the battle field we've seen in the last year. Vladimir Putin wants to won the geopolitical side of this war but his forces, his airstrikes are assisting the Syria regime as they march toward Aleppo. A huge task to take the rebel areas, tens or hundreds of thousands of people living in the skeleton of that city but these images we obtained show how intense the fighting is against moderate Syrian rebels, some receiving help from the U.S. on the front lines today.</s>WALSH (voice-over): This is what it's like on the receiving end of the Russian back defensive south of Aleppo. The moderate rebel fighter now lying flat, sent us these pictures saying it was the worst assault he'd ever seen, aided by drones that they also target. "The Russian strikes seem to hit civilians most, not us rebels," says this fighter before listing the several villages they've lost in recent days. These eyes in the sky seem to be speeding the regime advance. The fabled tow missile, an anti-tank rocket supplied by rebels often by the U.S. hitting regime army. It helped rebels take ground fast recently but many more were needed for them to hold it now. Syrian state TV showing while their president briefly visited Moscow, how they were advancing, ramming it home where in the south is now theirs. These images helping suggest why 50,000 civilians may now be on the move. One rebel caught this frontline volley on a body camera. Such high-tech intimacy in a fight that can seem so brutally medieval, where a new power is changing the balance but not lessening the old threat to those helpless caught in the middle.</s>WALSH: Now if that battle for Aleppo does get underway, we are talking about an unprecedented humanitarian crisis. The probable tactic of the regime will be to surround that rebel-held area and as they say in the past, staff and force surrender of those inside of it. Many looking to meetings on Friday between various foreign ministers including the U.S. and Russian and Syrian to see if there is any diplomatic headway that might be able to slow this down but I think the chance of that being accepted by all parties in this pretty remote. We're looking to the battlefield now, Wolf.</s>BLITZER: Awful situation, indeed. Nick, thanks very much. Nick Paton Walsh reporting for us. Breaking news coming up next, Joe Biden's long-awaited decision. The vice president announcing he will not make a bid for the White House but vowing he will not stay silent, either. What role will he play in the presidential campaign?