WASHINGTON, Feb 5 (Reuters) – The United States is worried that Russia, China and OPEC oil-producing countries could use their growing financial clout to advance political goals, the top U.S. spy chief told Congress on Tuesday. Such economic matters joined terrorism, nuclear proliferation and computer-network vulnerabilities as top U.S. security threats described by National Director of Intelligence Michael McConnell (center) in an annual assessment. McConnell said U.S. intelligence agencies had “concerns about the financial capabilities of Russia, China and OPEC countries and the potential use of their market access to exert financial leverage to political ends.”Russia, bolstered in part by oil revenues, was positioning itself to control an energy supply…