Exploding drones are lumbering and noisy and relatively easy to shoot from the sky and, over the New Year’s weekend, Ukraine says, its military downed every single one of about 80 that Russia sent the country’s way.President Volodymyr Zelensky of Ukraine, in an overnight speech, warned that Russia was betting on the “exhaustion of our people, our air defense, our energy sector.” Ukraine has vowed not to be cowed by the aerial assault, but the attacks have been unrelenting.The Iranian-made Shahed-136 drones that Moscow has increasingly been relying on since October are relatively uncomplicated devices and fairly cheap, while the array of weapons used to shoot them out of the sky can be much pricier, according to experts.Michael Kofman, an expert on the Russian military at the CNA research institute, said that Ukrainians were using “a zoo of different air defense systems” to combat the threat, including Soviet-era and NATO missile systems, each with its own cost profile.Some of Ukraine’s antiaircraft guns, like the Gepard 2 radar-directed mobile gun system, are inexpensive in comparison with other Soviet-era and European defense systems being deployed."