equipment that is being promised and indeed delivered from nato and from the united states and other nato countries coming to this arguably the most important battlefront in terms of the ukrainian defense against the russian invaders. so they re going after those very important railway lines with these bombardments. i have to say on top of that, though, the railway bridge that links leman to the other side of the donetsk river was also blown today. it s not clear, though, jake, whether it was the ukrainians or the russians that blew it because we do know that the ukrainians do have a tactic of blowing bridges in order to slow russian advances. they are going to use in all probability the donetsk river as a line of defense if it comes to that. there have been very substantial troop movements among the ukrainians on the ukrainian side throughout this region over the last 24 hours. and clearly an effort at least at re-enforcement is under way. a lot of movement of troops. a lot
fighting in this war, alongside the ukrainians. how many other u.s. fighters are risking their lives in ukraine right now? our correspondents are standing by on the ground in ukraine with refugees in poland and with president biden over at the white house. we want to welcome our viewers here in the united states, and around the world. i m wolf blitzer. you are in the situation room. tonight, russia is making slow but alarming new progress in this, the tenth week, of its brutal war against ukraine. noish officials in kyiv, moscow, and here in washington they are now digging in for this bloody conflict potentially to last for years. cnn s anderson cooper is standing by in the ukrainian capital for us. kai kaitlan collins is over at the white house. we will go live to them in just moments. but first, there is growing concern about the fate of the last holdouts in the besieged city of mariupol as cnn s jim sciutto reports from the war zone. reporter: hundreds of civilians