Key developments on May 14: * Zelensky instructs military to prepare response to Russia's deadly Kyiv attack * Russia 'ripping off' Ukraine's drone forces success, Unmanned Systems Forces commander says * Ukraine's military now 'strongest, most powerful' in Europe, Rubio says * 'Teachers told children Ukraine does not exist' — Kyiv brings back 8 children from Russian-occupied territories Editor's note: This story has been updated to reflect the latest casualty count as provided by Ukraine'

Air raid alerts rang out across Ukraine as a massive swarm of attack drones crossed the Russian border shortly after 11:00 a.m. local time.

Ukrainian President, Volodymyr Zelenskyy, has accused Russia of escalating its campaign of terror against civilians after a wave of overnight missile and drone attacks killed at…