.Putin phones cross-border strike in Kursk region a 'justification' The Washington PostRussia points out Ukrainian troops crossed right into its own territory and launched 'substantial assault' CNNHow deep into Russian territory possesses Ukraine's shock August incursion gotten to? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The New York City TimesRussia: Condition of unexpected emergency in Kursk amidst incursion DW (English).