.Putin phones cross-border attack in Kursk area a 'provocation' The Washington PostRussia states Ukrainian troops crossed in to its own area as well as released 'enormous strike' CNNHow deep in to Russian region has Ukraine's shock August attack reached? MeduzaUkraine Launches Rare Cross-Border Ground Assault Into Russia The New York TimesRussia: Condition of emergency in Kursk among attack DW (English).