.Putin phones cross-border assault in Kursk region a 'provocation' The Washington PostRussia points out Ukrainian troops crossed into its region as well as released 'substantial strike' CNNHow deep right into Russian region has Ukraine's surprise August attack hit? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The New York City TimesRussia: Condition of emergency situation in Kursk in the middle of attack DW (English).