left to take through the debris, trying to identify their fallen friends. mykolaiv is a port city one of several now, caught up in a battle for the south, which appears to be intensifying. in mariupol, a city surrounded by russian aggression, there is not much left. homes, cars, streets, destroyed. when i left mariupol, it was the first day of invasion, it felt like the most brutal hell. but now, what they do now, when russians do now is just complete extermination of the whole city, of this civilians. there are reports now of street fighting. russian troops are said to be moving closer to the heart of the city and those left to defend it are desperate. leaders of the u.s. in france, you promised us air defense systems. what we received is not quite