 Ukraine's air defense and mobile groups of drone hunters shot down 30 out of 31 Russian drones over 11 regions across the country on December 16. The Air Force said Dada's series of explosions resounded throughout the Ukrainian capital Kyiv as air defense units engaged Russian drones. Reuters witnesses said there were no casualties and no major damage reported in Kyiv, Serhi Popko. Head of the city's military administration said Kyiv Mayor Vitaly Klitschko said anti-aircraft units went into action. As groups of the Russian drones flew across the outskirts of the city and targeted areas near the city center, the Reuters witnesses reported loud blasts just after midnight. A new series of explosions over the next 45 minutes also hit areas near Kyiv's central districts, overnight air alerts in many Ukraine regions lasted for about five hours. Russian drone attacks on Ukrainian cities and regions have become increasingly frequent. Ukrainian officials have said Russia is targeting the nation's power and energy infrastructure during and ahead of the critical cold months of winter Moscow has denied targeting Ukraine's civilian infrastructure.