against an overwhelming force. so the russians have had very, very tough going north of kyiv in large part because of fierce resistance, but also because of the trafficability of the ground. it's been different elsewhere in the country not because the ukrainians haven't fought harder, but because it's more amenable to open maneuver and the russians have been able to move their forces, amass their forces and able to more isolate some of the ukrainian defenders. so there is a russian move in the south. it's moving up toward kyiv. that is a major concern. >> there's also a situation as far as kyiv is concerned that you have russian forces encircling mariupol. you have kharkiv under shelling as well. these two cities are in the east. they could fall within days, maybe a little bit longer, but they will fall. some have suggested that then gives russia effective control of eastern ukraine, which cuts off the capital from ukrainian