.Putin contacts cross-border strike in Kursk area a 'justification' The Washington PostRussia claims Ukrainian soldiers crossed right into its area and released 'large strike' CNNHow deep in to Russian region possesses Ukraine's unpleasant surprise August incursion hit? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The New York City TimesRussia: Condition of unexpected emergency in Kursk in the middle of attack DW (English).