.Putin contacts cross-border strike in Kursk area a 'justification' The Washington PostRussia says Ukrainian troops intercrossed into its own territory and also released 'substantial assault' CNNHow deep right into Russian region possesses Ukraine's shock August incursion arrived at? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The New York TimesRussia: Condition of emergency situation in Kursk among incursion DW (English).