.Putin phones cross-border strike in Kursk area a 'provocation' The Washington PostRussia states Ukrainian soldiers crossed in to its own area and also released 'substantial strike' CNNHow deep in to Russian area possesses Ukraine's unpleasant surprise August attack arrived at? MeduzaUkraine Launches Rare Cross-Border Ground Attack Into Russia The The Big Apple TimesRussia: State of unexpected emergency in Kursk in the middle of incursion DW (English).