Putin accuses Ukraine of ‘provocation’ amid alleged border incursion BBC.comRussia says Ukrainian troops crossed into its territory and launched ‘massive attack’ CNNPutin accuses Ukraine of ‘large-scale provocation’ at the Russian border CNBCUkraine’s incursion into Russia’s Kursk region continues into second day The GuardianRussia reports fierce battles against invading Ukrainian forces Al Jazeera English