.Putin phones cross-border attack in Kursk area a 'justification' The Washington PostRussia says Ukrainian troops crossed in to its own territory as well as introduced 'massive assault' CNNHow deep in to Russian region has Ukraine's unpleasant surprise August attack reached? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The The Big Apple TimesRussia: Condition of urgent in Kursk surrounded by attack DW (English).