.Putin calls cross-border assault in Kursk region a 'provocation' The Washington PostRussia says Ukrainian troops intercrossed into its area and released 'massive strike' CNNHow deep into Russian area has Ukraine's unpleasant surprise August attack hit? MeduzaUkraine Launches Rare Cross-Border Ground Assault Into Russia The New York TimesRussia: State of emergency in Kursk among attack DW (English).