Venezuela's President Hugo Chavez takes a sample of crude during his weekly broadcast at a nationalized oil field at Orinoco's belt in the southern strip of the eastern Orinoco River February 17, 2008. Chavez said on Sunday he will cut oil sales to the United States if Washington attacks the South American country as the country is in the midst of a legal battle with U.S. oil giant Exxon Mobil, which recently won court orders freezing up to $12 billion in Venezuelan assets to ensure compensation for an oil project Chavez nationalized last year. REUTERS/Miraflores Palace/Handout (VENEZUELA). EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.