.Putin contacts cross-border strike in Kursk area a 'provocation' The Washington PostRussia states Ukrainian soldiers crossed into its own region and introduced 'large attack' CNNHow deep right into Russian area possesses Ukraine's unpleasant surprise August attack reached? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The New York TimesRussia: State of emergency in Kursk amid incursion DW (English).