shouting we are told for the third time that day we're told for the third time that day to get into a nearby underground shelter. the russians are pretty determined to break these lines. are they going to get past here? past you and these men? translation: i think no. we will not surrender kharkiv. our loved ones have got our backs. they won't get through here. quentin sommerville, bbc news, kharkiv. president biden says nato has never been more united and that russia's president, vladimir putin, is getting the opposite of what he intended when he ordered the invasion of ukraine. the us president was speaking after a summit in which leaders approved plans to send new battlegroups to four countries. our north america editor sarah