Ukraine has destroyed two of Russia's Pantsir-S1 air-defense systems, officials said on Sunday, in the latest push by Kyiv to take out key Russian assets and ground-based weaponry. Fighters with Ukraine's intelligence agency, the GUR, took out two Pantsir-S1 anti-aircraft systems in Russia's Belgorod border region on Saturday, the agency said in a statement on Sunday. Russian air defenses close to the country "turned out to be leaky," added Ivan Fedorov, the exiled Ukrainian mayor of the southern Moscow-controlled city of Melitopol.