.Putin calls cross-border strike in Kursk region a 'justification' The Washington PostRussia states Ukrainian soldiers crossed in to its own region and also released 'huge strike' CNNHow deep in to Russian area has Ukraine's surprise August attack hit? MeduzaUkraine Launches Rare Cross-Border Ground Assault Into Russia The The Big Apple TimesRussia: State of emergency in Kursk amidst incursion DW (English).