The United States has disclosed details of its latest military aid package to be used by Ukraine's forces in the country's east after Russian forces this week launched a full-scale offensive in the region. The new $800m assistance package includes a new unmanned aerial weapons system, or drone, dubbed the Phoenix Ghost. Pentagon spokesman John Kirby said the drones, which are produced by a US company, Aevex Aerospace, are particularly well suited for the fight in Ukraine's east, in the flat and open terrain of the region known as Donbas. "Without getting into the specifications, but the kinds of things this drone can do lend itself well to this particular kind of terrain," Kirby told reporters on Thursday. "I think I'm just going leave it at that. But its purpose is akin to that of the Switchblade … which is basically a one-way drone, an attack drone. And that's essentially what this is designed to do".

Fox News Flash top headlines are here. Check out what's clicking on Foxnews.com. The Pentagon announced Thursday that it will deliver over 120 "Phoenix Ghost" drones specifically designed by the U.S. Air Force for Ukrainian "needs" as the war with Russia ramps up. U.S. defense officials have warned that Russia's invasion in the eastern Luhansk and Donetsk regions will be a more brutal fight as Moscow "shapes" its new strategy in the Donbas region to address specific terrain challenges. A senior defense official told reporters Thursday that the "Phoenix Ghost" is a tactical unmanned aerial system that "was rapidly developed by the Air Force in response specifically to Ukrainian requirements."