And now, we want to take you into the heart of chaos in Ukraine. Chaos which could force international action, even by the U.S. Tonight, a city is in ruins, seen from above and a bloody battle is... See More
And now, we want to take you into the heart of chaos in Ukraine. Chaos which could force international action, even by the U.S. Tonight, a city is in ruins, seen from above and a bloody battle is playing out on the ground, amid reports of a truce coming in tonight. ABC's chief foreign correspondent terry Moran is right there. Terry? Reporter: That truce was announced late tonight. One day after he sent security forces into the square behind me, touching off a bloody battle. They're still out there. The fires are still burning. And tonight, there is no sign of a cease-fire. All dale today and into the night, downtown kiev smoldered and burned. This city, and the world, still shaken by the terrible scenes that flashed from here yesterday. Protesters shot down. Police lines aflame. The dead lying in the streets. But this afternoon, when we clam B clambored over the barricades, we found thousands gathered again, young and old, men and women, undeterred, undaunted. They say they want freedom and democracy. This is the last war. This is the last chance for us. If not, we will fall down. Everything -- everything will be broken. Reporter: At stake in this bitter struggle, will this country of 46 million people turn west toward the U.S. And Europe and democracy or turn east to Vladimir Putin and Russia which ruled here for centuries? President yanukovych, elected in 2010, but who now stands accused by opponents of massive corruption and unleashing secret police on protesters. He chose Moscow. The U.S. Is pushing back. There will be consequences if people step over the line. And that includes making sure that the Ukrainian military does not step in to what should be a set of issues that can be resolved by civilians. Reporter: Here in kiev, they are bracing for the worst. This is the front line on this side, the protesters, on the other side, just 100 feet away or so, the police. And they are armed for battle here with their weapon of choice, the stones they've torn from the pavement. Everyone pitches in out here. There is plenty of food, handmade sandwiches gougt home. And the beautiful cathedral of St. Michael, a makeshift hospital now, treating the wounded. Morale is still high. As dusk drew down, they rose and sang Ukraine's national about them. The worlds of the chorus, "Souls and bodies, we will lay down, all for our freedom." They mean it. This is a nation on a knife's edge, looking over into an abyss of possible civil war. And the question about that truce is, can it hold? The protesters are demanding new elections. The president is refusing. And the bloodshed has radicalized both sides. Diane? Terry Moran reporting from the center of the story tonight. Thank you so much, terry.
This transcript has been automatically generated and may not be 100% accurate.