Venezuela's plans to purchase a large amount of weapons is fueling concern about a new arms race in South America.

After a trip to Russia last week, Venezuelan President Hugo Chavez announced a $2 billion agreement to purchase 92 Russian tanks and advanced anti-aircraft missiles. 
    
Chavez had already bought billions of dollars worth of Russian arms, including 24 fighter jets, dozens of attack helicopters and 100,000 assault rifles.

Secretary of State Hillary Clinton said Venezuela's purchases outpace all other countries in South America. 
    
She's urging Venezuela to ensure that the weapons are not diverted to insurgent groups or drug trafficking gangs.