.Putin contacts cross-border assault in Kursk area a 'provocation' The Washington PostRussia states Ukrainian troops crossed into its own area as well as introduced 'massive strike' CNNHow deep into Russian territory possesses Ukraine's shock August attack hit? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The Nyc TimesRussia: Condition of unexpected emergency in Kursk surrounded by attack DW (English).