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Investigators work at the place where Lt. General Igor Kirillov, the head of Russia's Nuclear, Biological, and Chemical Defence Forces and his assistant, seen at lower center, were killed by an explosive device planted close to a residential apartment's block in Moscow, Russia, Tuesday, Dec. 17, 2024. (AP Photo)

Investigators work at the place where Lt. General Igor Kirillov, the head of Russia's Nuclear, Biological, and Chemical Defence Forces and his assistant, seen at lower center, were killed by an explosive device planted close to a residential apartment's block in Moscow, Russia, Tuesday, Dec. 17, 2024. (AP Photo)

FILE - Maj. Gen. Igor Kirillov, the chief of the Russian military's radiation, chemical and biological protection unit, attends a briefing in Kubinka Patriot park, outside Moscow, Russia, on June 22, 2018. (AP Photo, File)

FILE - Maj. Gen. Igor Kirillov, the chief of the Russian military's radiation, chemical and biological protection unit, attends a briefing in Kubinka Patriot park, outside Moscow, Russia, on June 22, 2018. (AP Photo, File)

Investigators work at the place where Lt. General Igor Kirillov, the head of Russia's Nuclear, Biological, and Chemical Defence Forces and his assistant, seen at left, were killed by an explosive device planted close to a residential apartment's block in Moscow, Russia, Tuesday, Dec. 17, 2024. (AP Photo)

Investigators work at the place where Lt. General Igor Kirillov, the head of Russia's Nuclear, Biological, and Chemical Defence Forces and his assistant, seen at left, were killed by an explosive device planted close to a residential apartment's block in Moscow, Russia, Tuesday, Dec. 17, 2024. (AP Photo)

A view of the place where Lt. General Igor Kirillov, the head of Russia's Nuclear, Biological, and Chemical Defence Forces and his assistantIlya Polikarpov were killed by an explosive device planted close to a residential apartment's block in Moscow, Russia, Tuesday, Dec. 17, 2024. (AP Photo)

A view of the place where Lt. General Igor Kirillov, the head of Russia's Nuclear, Biological, and Chemical Defence Forces and his assistantIlya Polikarpov were killed by an explosive device planted close to a residential apartment's block in Moscow, Russia, Tuesday, Dec. 17, 2024. (AP Photo)