Ukrainian forces are pushing further into the Kursk region of Russia, in a cross-border incursion that surprised even American officials, multiple US and Ukrainian officials tell CNN. Ukrainian forces are comprised of a mix of Ukrainian regular and special operations units, unlike previous Ukrainian operations inside Russia that often involved undercover units and local sympathizers. The intention, say US and Ukrainian officials, is multifaceted, in part to disrupt and demoralize Russian forces and in part to divert Russian forces away from other parts of the eastern front. Russia claimed on Thursday to have halted a Ukrainian incursion into its territory,...