.Putin phones cross-border strike in Kursk region a 'provocation' The Washington PostRussia mentions Ukrainian troops crossed in to its own territory and released 'substantial assault' CNNHow deep into Russian region has Ukraine's unpleasant surprise August attack hit? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The New York TimesRussia: Condition of emergency situation in Kursk amid incursion DW (English).