CARTAGENA (Reuters) -- Colombian President Alvaro Uribe on Friday urged the United States to slap severe sentences on drug traffickers extradited from his country, in a rare rebuke from a staunch U.S. ally.

Uribe, who has received billions of dollars in U.S. aid to fight cocaine traffickers and leftist guerrillas, said negotiating short jail terms with traffickers in exchange for information often ended up mocking counter-narcotics efforts.
""We are concerned negotiations with drug traffickers means they are given sentences that are practically indulgent, they become a mockery,"" Uribe told Latin American leaders at a regional anti-drugs summit.
""The next stage in extradition we want to examine with U.S. officials is that any negotiation with extradited drug traffickers means they face a minimum severe penalty.""
Uribe has been one of Washington's closest supporters and his government has extradited hundreds of suspected drug smugglers to the United States.
He was speaking at a summit attended by Mexico's President Felipe Calderon and other Latin American and Caribbean leaders who agreed to deepen international cooperation efforts, including sharing intelligence and attacking money laundering.
Colombia remains the world's No. 1 cocaine producer despite more than $5 billion in U.S. aid. Mexico is now battling against cartels fighting over drug routes north and has turned to Colombia for possible lessons from its long fight against drugs.