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

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, 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,

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.

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.

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,

Russia has arrested four people on suspicion of plotting to assassinate senior defence officials and their families on Ukraine’s orders, the Kremlin’s Federal Security Service (FSB) said.

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.

Russia's security service said four Russian citizens were recruited by Ukraine to carry out the assassinations