Ukraine Says It Assassinated Russian General Igor Kirillov in Moscow Bombing

A general in charge of the Russian military’s nuclear and chemical weapons protection forces was killed by a bomb on a Moscow street on Tuesday, in one of the most brazen assassinations since Russia’s full-scale invasion of Ukraine nearly three years ago.

The general, Igor Kirillov, 54, died along with an aide after an explosive device planted in a scooter was detonated on Tuesday morning near the entryway to a residential building, Russia’s Investigative Committee, a law enforcement agency, said in a statement.

An official with Ukraine’s security service, known as the S.B.U., said that Ukraine was responsible for the killing. The official, who spoke on the condition of anonymity to discuss a sensitive intelligence operation, confirmed the details of the assassination given by Russia.

The S.B.U. considered General Kirillov a legitimate target, the official said.

A day before the general’s killing, Ukraine had accused him of criminal activity, saying he was responsible for the “massive use of banned chemical weapons” in Ukraine. The security service said that Russian troops had dropped ammunition with toxic compounds onto Ukrainian positions in efforts to force Ukrainian soldiers out of their trenches.

According to the Russian military, the division that General Kirillov oversaw carries out specialized tasks like protecting Russian troops when chemical and nuclear weapons are used, as well as offensive operations like attacks with incendiary weapons.