.Putin gets in touch with cross-border attack in Kursk region a 'provocation' The Washington PostRussia claims Ukrainian soldiers intercrossed in to its own area and released 'substantial strike' CNNHow deep in to Russian region has Ukraine's surprise August attack hit? MeduzaUkraine Launches Rare Cross-Border Ground Assault Into Russia The New York TimesRussia: State of urgent in Kursk amidst incursion DW (English).