BEIJING, July 6 -- The chairman of CNOOC Ltd., the Chinese energy firm embroiled in a thorny campaign to purchase the U.S. oil company Unocal Corp., voiced dismay on Wednesday over what he called "overreaction" from Washington by those portraying the deal as a threat to fair trade and U.S. national security.In an interview with The Washington Post at CNOOC's headquarters in Beijing, Chairman Fu Chengyu said critics of his company's bid for Unocal were guilty of viewing China through an outdated lens by failing to appreciate how economic reforms have forced Chinese companies to adopt market principles and focus...