(Reuters) – Ukraine was set to ask U.S. Secretary of State Antony Blinken and Defence Secretary Lloyd Austin for more powerful weapons to repel a Russian offensive in the south and east during talks in Kyiv as the Russian invasion enters its third month. FIGHTING * Russian forces again attempted to storm the Azovstal steel plant, the main remaining Ukrainian stronghold in Mariupol, Ukrainian officials said, adding that more than 1,000 civilians are also sheltering there. * Eight people were killed in Russian attacks in Ukraine’s Luhansk region on Saturday, regional governor Serhiy Gaidai said …