A Russian general was killed by a bomb in Moscow. Ukraine claims responsibility.

A senior Russian general was killed Dec. 17 by a bomb hidden in a scooter outside his apartment building in Moscow, a day after Ukraine’s security service leveled criminal charges against him. A Ukrainian official said the service carried out the attack.

Lt. Gen. Igor Kirillov, the chief of the military’s nuclear, biological, and chemical protection forces, was killed as he left for his office. Mr. Kirillov’s assistant also died in the attack.

Mr. Kirillov was under sanctions from several countries, including the U.K. and Canada, for his actions in Moscow’s war in Ukraine. On Dec. 16, Ukraine’s Security Service, or SBU, opened a criminal investigation against him, accusing him of directing the use of banned chemical weapons.

An official with the SBU said the agency was behind the attack. The official, who spoke on condition of anonymity because they were not authorized to release the information, described Mr. Kirillov as a “war criminal and an entirely legitimate target.”

The SBU has said it recorded more than 4,800 occasions when Russia used chemical weapons on the battlefield since its full-scale invasion in February 2022. In May, the U.S. State Department said that it had recorded the use of chloropicrin, a poison gas first deployed in World War I, against Ukrainian troops.

Russia has denied using any chemical weapons in Ukraine and, in turn, has accused Kyiv of using toxic agents in combat.

Mr. Kirillov, who took his current job in 2017, was one of the most high-profile figures to level those accusations. He held numerous briefings to accuse the Ukrainian military of using toxic agents and planning to launch attacks with radioactive substances – claims that Ukraine and its Western allies rejected as propaganda.

The bomb used in the attack on Dec. 17 was triggered remotely, according to Russian news reports. Images from the scene showed shattered windows and scorched brickwork.

The SBU official provided video that they said was of the bombing. It shows two men leaving a building shortly before a blast fills the frame.

Russia’s top state investigative agency said it’s looking into Mr. Kirillov’s death as a case of terrorism, and officials in Moscow vowed to punish Ukraine.

Dmitry Medvedev, deputy head of Russia’s Security Council chaired by President Vladimir Putin, described the attack as an attempt by Kyiv to distract public attention from its military failures and vowed that its “senior military-political leadership will face inevitable retribution.”

In the past year, Russia has been on the front foot in the war, grinding deeper into the Donetsk region of eastern Ukraine despite heavy losses. Ukraine tried to change the dynamic with an incursion into Russia’s Kursk region, but it has continued to slowly lose ground on its own territory.

Since Russia invaded, several prominent figures have been killed in targeted attacks believed to have been carried out by Ukraine.

Darya Dugina, a commentator on Russian TV channels and the daughter of Kremlin-linked nationalist ideologue Alexander Dugin, died in a 2022 car bombing that investigators suspected was aimed at her father.

Vladlen Tatarsky, a popular military blogger, died in April 2023, when a statuette given to him at a party in St. Petersburg exploded. A Russian woman, who said she presented the figurine on orders of a contact in Ukraine, was convicted and sentenced to 27 years in prison.

In December 2023, Illia Kiva, a former pro-Moscow Ukrainian lawmaker who fled to Russia, was shot and killed near Moscow. The Ukrainian military intelligence lauded the killing, warning that other “traitors of Ukraine” would share the same fate.

On Dec. 9, a bomb planted under a car in the Russian-occupied Ukrainian city of Donetsk killed Sergei Yevsyukov, the former head of the Olenivka Prison where dozens of Ukrainian prisoners of war died in a missile strike in July 2022. One other person was injured in the blast. Russian authorities said they detained a suspect in the attack.

This story was reported by the Associated Press. AP writer Illia Novikov contributed to this report.