KYIV, Ukraine (AP) – Russian forces are tightening the noose around the defenders holed up in a mammoth steel plant that is the last known Ukrainian stronghold in in the besieged city of Mariupol. A fighter apparently on the inside issued a video plea for help. He said the defenders may have only a few days or hours left. With the holdouts punished by new bombing attacks, another attempt to evacuate civilians trapped in the city has failed because of continued fighting. Separately, the governor of Ukraine’s Luhansk region says Russian forces now control 80 percent of it. It is one of two regions that make up the Donbas in eastern Ukraine.