.Putin calls cross-border strike in Kursk region a 'provocation' The Washington PostRussia claims Ukrainian troops crossed right into its territory as well as released 'massive strike' CNNHow deep right into Russian territory possesses Ukraine's surprise August attack hit? MeduzaUkraine Launches Rare Cross-Border Ground Assault Into Russia The New York City TimesRussia: State of emergency in Kursk in the middle of incursion DW (English).