.Putin calls cross-border strike in Kursk area a 'provocation' The Washington PostRussia says Ukrainian troops crossed into its area and also launched 'enormous strike' CNNHow deep into Russian area possesses Ukraine's unpleasant surprise August incursion hit? MeduzaUkraine Launches Rare Cross-Border Ground Assault Into Russia The New York TimesRussia: Condition of unexpected emergency in Kursk in the middle of attack DW (English).