>> just before you joined us, we heard sirens here, sounded like a couple of distant exploesions and quick crack of gunfire. doesn't necessarily suggest anything particularly major is underway, but it's a sign of how greatly on edge this major southern port is. but let me tell you more about kherson. we were there days ago watching a battle for the bridge on its eastern outskirts, but since yesterday, we've seen increased videos of russian forces inside that city. i heard from a local resident that people in the town have been chanting we are an independent country in the face of russian troops moving forward. but since yesterday, too, videos have been emerging of russian