Heavy fighting was reported on the border between Russia and Ukraine on Tuesday, as Moscow said it had used fighter jets and artillery fire to repel a major Ukrainian offensive. According to Russia, hundreds of Ukrainian soldiers attempted to storm across the border in the southern Russian region of Kursk with the support of tanks. “The enemy was repulsed by artillery fire, airstrikes and the use of combat drones,” the Russian Ministry of Defence said late on Tuesday. Videos circulating on social media showed a burnt-out tanker truck at an unspecified location. Kursk Governor Alexei Smirnov sa…