.Putin phones cross-border strike in Kursk region a 'provocation' The Washington PostRussia claims Ukrainian troops intercrossed into its territory as well as introduced 'massive assault' CNNHow deep in to Russian territory possesses Ukraine's surprise August attack hit? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The Nyc TimesRussia: Condition of unexpected emergency in Kursk in the middle of incursion DW (English).