Ukraine kills 12 in drone strikes on Russian city of Nizhnekamsk, state media reports

Viktor Kruhlov, director of Ranok, one of Ukraine's largest children's publishers, struggled to hold back tears as he watched pile after pile of his books turn to ash.

The strikes killed at least 12 people in one of Kyiv's deadliest attacks since the Russian invasion began over four years ago.

Besides the more than a dozen fatalities, Belyayev said 39 people were injured.

The city, some 1,000 kilometers within Russia, hosts a major oil refinery, with facilities long targeted by Ukrainian army.