Source: http://flagspot.net/flags/su.html

The Soviet Union Overview:

The Soviet Union started developing its chemical and biological weapons program in 1926. During World War II, production of all types of chemical agents increased dramatically. As with most other countries involved in World War II, the Soviets never deployed its weapons; instead, it stockpiled them as a deterrent.

Highlights:

• The Soviets focused on typhus as a BW agent, but also included an aircraft-mounted dispenser for Yersinia pestis (Plague) which reportedly sprayed “an emulsion” of the agent
• Yperite alone was produced by 30 plants with a total capacity of 35,000 tons/year, and Lewisite was produced by 13 plants.
• They also built aerial bombs, filled with a mixture of deadly lewisite, a blistering poison gas, and yperite, a sulfur mustard gas.

Sources:

http://www.fas.org/nuke/guide/russia/cbw/cw.htm

http://www.fas.org/bwc/papers/review/wwii.htm

http://www.washingtonpost.com/wp-srv/inatl/longterm/coldwar/leonidovkaa.htm