By MARTIN SIEFFUPI Senior News AnalystWASHINGTON, Nov. 20 (UPI) -- Russian leaders have approved an additional $1 billion loan to Venezuela to cover the costs of purchasing Russia's advanced, short-range TOR-M1 anti-aircraft and anti-missile system, along with Igla-S portable SAM systems, Il-78 aerial tankers and Il-76 military cargo aircraft.