President Volodymyr Zelensky on May 14 said he had instructed Ukraine's military to prepare "possible formats for our response" to a deadly Russian missile and drone strike on Kyiv that killed at least 24 people and injured at least 48 others

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.

Several people in Kyiv were killed and at least 20 people were reported missing after 24 hours of intense Russian airstrikes.