Exxon Mobil has gone after the assets of state oil company Petroleos de Venezuela SA in U.S., British and Dutch courts as it challenges the nationalization of a multibillion dollar oil project by Chavez's government.

A British court has issued an injunction "freezing" as much as $12 billion in assets.

"If you end up freezing (Venezuelan assets) and it harms us, we're going to harm you," Chavez said during his weekly radio and television program, "Hello, President." "Do you know how? We aren't going to send oil to the United States. Take note, Mr. Bush, Mr. Danger."

Chavez has repeatedly threatened to cut off oil shipments to the United States, which is Venezuela's No. 1 client, if Washington tries to oust him. Chavez's warnings on Sunday appeared to extend that threat to attempts by oil companies to challenge his government's nationalization drive through lawsuits.

"I speak to the U.S. empire, because that's the master: continue and you will see that we won't sent one drop of oil to the empire of the United States," Chavez said Sunday.

"The outlaws of Exxon Mobil will never again rob us," Chavez said, accusing the Irving, Texas-based oil company of acting in concert with Washington.

A U.S. Embassy spokeswoman did not immediately return a call seeking comment.

Venezuelan Oil Minister Rafael Ramirez has argued that court orders won by Exxon Mobil have "no effect" on the state oil company PDVSA and are merely "transitory measures" while Venezuela presents its case in courts in New York and London.

Exxon Mobil is also taking its claims to international arbitration, disputing the terms it was granted under Chavez's nationalization last year of four heavy oil projects in the Orinoco River basin, one of the world's richest oil deposits.

Other major oil companies including U.S.-based Chevron Corp., France's Total, Britain's BP PLC, and Norway's StatoilHydro ASA have negotiated deals with Venezuela to continue on as minority partners in the Orinoco oil project.