The head of Russia's chemical and biological forces, Lt. General Igor Kirillov, was killed in a Moscow bomb blast claimed by Ukraine.

Igor Kirillov, head of Russia's nuclear and chemical defense, helped spread false claims about Ukraine, the U.S. and COVID-19.

Kirillov ran Russia’s nuclear, biological and chemical defense forces. Kyiv previously accused him of ordering the use of chemical weapons against Ukraine.

Kirillov, 54, is the most senior Russian military officer to be assassinated inside Russia by Ukraine and his murder is likely to prompt the Russian authorities to review security protocols for the army's top brass.

A top Russian general accused by Ukraine of being responsible for the use of chemical weapons against Ukrainian troops was assassinated in Moscow by Ukraine's SBU intelligence service on Tuesday morning in the most high-profile killing of its kind.

An explosion in Moscow kills Lieutenant General Igor Kirillov, chief of the Russian Armed Forces' radiation, chemical, and biological defense troops. The Security Service of Ukraine is behind the operation to eliminate him,

Igor Kirillov, a senior general in charge of Russia’s nuclear defence forces, was killed on Tuesday in a bomb blast in Moscow. A source in the Security Service of Ukraine (SBU), talking to Al Jazeera,

Ukrainian sources were quick to background journalists to say they were behind the killing of Russian General Igor Kirillov. Experts say it's likely not that simple.

Lieutenant General Igor Kirillo, 54, died early on Tuesday after a device hidden inside a scooter was detonated as he emerged from his apartment block - with his driver also killed

President Vladimir Putin further cemented his grip on power and sought to counter Russia's isolation from the West over the war in Ukraine. But he faced continuing challenges, with a deadly attack by gunmen in Moscow and an incursion by Kyiv's troops on his territory.

Russia's Federal Security Service (FSB) announced on Thursday the arrests of four individuals accused of plotting to assassinate senior Russian military officers, alleging the scheme was orchestrated by Ukrainian intelligence.