The notification to Congress, posted Friday on a Pentagon Web site, includes Black Hawk helicopters, Patriot Advanced Capability-3 missiles, mine hunter ships and information technology. Congress has 30 days to comment before the plan goes forward; senior lawmakers traditionally have supported such sales.
Taiwan is the most sensitive matter in U.S.-China relations, with the potential to plunge into conflict two powers increasingly linked in security and economic issues. China claims the self-governing island as its own. The United States is Taiwan's most important ally and its largest arms supplier.
The United States, which told China of the sale only hours before the announcement, acknowledged that Beijing may retaliate by cutting off military talks with Washington, which happened after the Bush administration announced a multibillion-dollar arms sale to Taiwan in 2008.
The U.S. is "obstinately making the wrong decision," China's Foreign Ministry said in a statement Saturday after Vice Foreign Minister He Yafei warned Ambassador Jon Huntsman the sale would "cause consequences that both sides are unwilling to see." The vice minister urged that the sale be immediately canceled, it said.
Wang Baodong, a spokesman for the Chinese Embassy in Washington, said Beijing will lodge a formal protest against the U.S. decision. Asked if China would halt military talks, he said, "Let's wait and see."
"We strongly request that the U.S. side correct the wrong action, so as to avoid further damaging Chinese-U.S. relations," Wang said. "The Taiwan question and the arms sale issue bear on China's sovereignty and territorial integrity, so this is a very serious problem."
Though Taiwan's ties with China have warmed considerably since Taiwanese President Ma Ying-jeou took office 20 months ago, Beijing has threatened to invade if the island ever formalizes its de facto independence.
Ma told reporters Saturday that the deal should not anger the mainland because the weapons are defensive, not offensive.
Despite its size, the U.S. weapons package dodges a touchy issue: F-16 fighter jets that Taiwan covets are not included. Senior U.S. officials said they are aware of Taiwan's desire for F-16s and are assessing Taiwan's needs.
The arms package includes 114 PAC-3 missiles and other equipment, costing more than $2.8 billion; 60 UH-60M Black Hawk helicopters, costing $3.1 billion; information distribution systems and other equipment, at $340 million; two Osprey Class Mine Hunting Ships, at a cost of about $105 million; and other items.