.Putin gets in touch with cross-border assault in Kursk region a 'provocation' The Washington PostRussia states Ukrainian soldiers intercrossed in to its own territory as well as introduced 'massive assault' CNNHow deep in to Russian territory has Ukraine's surprise August incursion hit? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The New York City TimesRussia: State of emergency in Kursk among attack DW (English).