.Putin contacts cross-border attack in Kursk area a 'provocation' The Washington PostRussia points out Ukrainian troops crossed into its territory and also launched 'enormous assault' CNNHow deep in to Russian area possesses Ukraine's unpleasant surprise August attack reached? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The New York TimesRussia: Condition of urgent in Kursk amid attack DW (English).