(KYIV, Ukraine) — Russian forces tightened the noose around the defenders holed up Wednesday in a mammoth steel plant that represented the last known Ukrainian stronghold in Mariupol, as a fighter apparently on the inside pleaded on a video for help: “We may have only a few days or hours left.”

With the holdouts coming under punishing new bombing attacks, another attempt to evacuate civilians trapped in the pulverized port city failed because of continued fighting.