.Putin contacts cross-border assault in Kursk region a 'justification' The Washington PostRussia points out Ukrainian troops crossed right into its territory as well as introduced 'huge strike' CNNHow deep in to Russian territory has Ukraine's shock August attack hit? MeduzaUkraine Launches Rare Cross-Border Ground Assault Into Russia The New York City TimesRussia: Condition of urgent in Kursk surrounded by incursion DW (English).