.Putin contacts cross-border strike in Kursk location a 'provocation' The Washington PostRussia states Ukrainian troops intercrossed in to its area and released 'massive strike' CNNHow deep in to Russian region has Ukraine's surprise August attack hit? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The Nyc TimesRussia: Condition of emergency in Kursk amid attack DW (English).