Ukraine said on Sunday it had targeted a crucial Russian explosives factory, located about 750 kilometers (470 miles) from the border, in an overnight drone attack. Kyiv has repeatedly launched drone attacks deep into Russian territory, seeking to hit energy and military sites that it says are key to supplying Moscow’s invading army. A source in the SBU security services told AFP its drones had struck the Sverdlov explosives factory in Dzerzhinsk, just outside the Russian city of Nizhny Novgorod. Russian officials confirmed drones had targeted the area but said the attack had been foiled. “Air…