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.

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.

Russia said on Wednesday it had detained an Uzbek man who had confessed to planting and detonating a bomb which killed a top general, Igor Kirillov, in Moscow on the instructions of Ukraine's SBU security service.

Igor Kirillov, a general in charge of Russia’s military’s nuclear and chemical weapons protection forces, was killed on Tuesday by a bomb in Moscow, the Russian authorities said.

Lieutenant General Igor Kirillov met his demise in Moscow on Dec. 17, reportedly killed by a bomb attached to a scooter planted by the Security Service of Ukraine (SBU). "Kirillov was a war criminal and a completely legitimate target,

Russian officials say a man has been detained over the killing of Lt. General Igor Kirillov, who led Russia's chemical and biological weapons unit.

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.

Igor Kirillov, who was named the head of Russia’s nuclear defense forces in April 2017, was under sanctions from several countries including the U.K. and Canada for his role in Ukraine.

Ukraine carried out one of its most audacious operations on Russian soil, killing a top military commander by detonating a scooter on the snowy streets of Moscow.

Lt. Gen. Igor Kirillov died in a blast in Moscow a day after he was charged by Ukraine's security services with the use of banned chemical weapons.