A Ukrainian drone attack on Russia's central Tatarstan region killed at least 12 people and wounded 39 on Monday, regional authorities said, as Moscow reported intercepting 456 drones overnight across about 15 Russian regions and annexed Crimea.
The attack on Nizhnekamsk was among the deadliest single Ukrainian strikes reported during the more than four-year war.
"According to the latest information, 12 people have been killed and 39 wounded as a result of the enemy drone attack on Nizhnekamsk," the regional press service said in a statement carried by Russian state media.
Authorities said industrial and civilian infrastructure in Nizhnekamsk, about 1,600 kilometers from the Ukrainian border, had been targeted.
Medical assistance was being provided to the wounded, while emergency services continued working and monitoring the situation.
Authorities declared a period of mourning following the deaths.
Russian social media accounts also claimed that Nizhnekamskneftekhim, described as one of Europe's largest petrochemical plants, had been targeted.
Russia's Defense Ministry said air defense systems intercepted and destroyed 456 Ukrainian drones overnight.
"Over the past night, air defense systems intercepted and destroyed 456 Ukrainian aerial drones," the ministry said, adding that around 15 Russian regions and annexed Crimea were targeted.
Authorities in Russia's Belgorod region, which borders Ukraine, said a woman was killed when a drone targeted a house in the village of Novaya Tavolzhanka.
More than four years after Russia launched its large-scale offensive against Ukraine, diplomacy remains stalled while both countries have intensified long-range strikes, contributing to rising civilian casualties.
Separately, a Russian artillery strike killed five people in the village of Bugaivka in Ukraine's northeastern Kharkiv region on Monday, according to the regional prosecutor's office.
"On August 10, Russian forces carried out a massive artillery strike on the residential area of the village of Bugaivka in the Chuguiv district," prosecutors said in a statement.
"Houses were destroyed as a result of the enemy attack. Five people were killed."
The Chuguiv District Prosecutor's Office opened a pretrial investigation into an alleged war crime resulting in deaths under Article 438, Part 2 of Ukraine's Criminal Code.
The attacks come after the European Union said Wednesday it would provide Ukraine with an additional €1.4 billion generated from frozen Russian central bank assets.
European Commission President Ursula von der Leyen announced the funding after condemning a deadly Russian attack on the Kyiv region.
The money consists of interest and windfall profits generated during the first half of 2026 from Russian assets immobilized under EU sanctions, according to the European Commission.
The funds were transferred to the EU budget and will be made available to Ukraine to support its continued resistance against Russia's war.
"Russia must pay for the destruction it has caused," von der Leyen said.
"And we are using the proceeds from the immobilised Russian assets to make sure it does."