.Putin contacts cross-border attack in Kursk region a 'provocation' The Washington PostRussia states Ukrainian troops intercrossed into its region and released 'enormous assault' CNNHow deep in to Russian territory has Ukraine's unpleasant surprise August attack reached? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The The Big Apple TimesRussia: State of unexpected emergency in Kursk surrounded by attack DW (English).