One of Russia’s largest explosives plants was torched in an overnight drone blitz Saturday by Ukrainian forces, as Kyiv continues its campaign to target military infrastructure deep behind enemy lines. The Nevinnomyssk Azot factory in the southwest city of Stavropol is one of Russia’s largest producers of chemicals used to make explosives. It’s been described as a “critical component” of Russian strongman Vladimir Putin’s war machine — producing more than 4 million tons of ammonium products and