.Putin gets in touch with cross-border strike in Kursk area a 'provocation' The Washington PostRussia says Ukrainian soldiers intercrossed into its own area and also launched 'massive strike' CNNHow deep in to Russian area has Ukraine's surprise August attack reached? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The New York City TimesRussia: State of emergency in Kursk surrounded by attack DW (English).