.Putin phones cross-border strike in Kursk area a 'justification' The Washington PostRussia says Ukrainian soldiers crossed into its own area as well as released 'extensive assault' CNNHow deep in to Russian area possesses Ukraine's surprise August incursion hit? MeduzaUkraine Launches Rare Cross-Border Ground Assault Into Russia The New York City TimesRussia: Condition of urgent in Kursk surrounded by attack DW (English).