Ukrainian jets and troops storm into Russia as Putin fears nuclear plant seizure in new assault. Putin calls it a 'major provocation' and accuses Ukraine of firing at civilian targets. Fighting focuses on small villages near the border. Videos show the attack, including destruction of Russian helicopters. Ukraine aims to capture a nearby nuclear power plant. Russia struggles to contain the incursion.
Key Points
Ukrainian forces storm into Russia near the Kursk region
Accusations of indiscriminate firing at civilian targets