situation dire. mariupol is probably the best example of that. hundreds of thousands of people have been trapped for several weeks. while there's been a trickle of people managing to get out of that city in private vehicles, that is very much a drop in the bucket. president zelenskyy says that yesterday humanitarian corridors simply did not work. there were some people as i mentioned who got out of mariupol, but through unofficial routes and even those, parts of the convoys there were actually hit by russian shelling. >> scott mclean live in lviv, thank you for the important reporting. let's get insights from the former deputy assistant secretary of defense, evelyn farcus. let's start with the point scott mclean was just making there. and nick paton walsh before him. two things can be true at once. we're seeing russian army incompetence. russian army logistic problems. russian army advance problems and also the very same time, what you might celebrate that if you're on ukraine's side as you