The sale is comparatively small in scale and does not expand the range of US weaponry to Taiwan, but comes as the United States and China move delicately to stabilize their turbulent relationship.

In a notification to Congress, the State Department said it would sell $332.2 million in 30mm ammunition and related equipment to Taiwan and $108 million in spare and repair parts for wheeled vehicles and weapons.

The sales will help Taiwan "maintain a credible defensive capability" but "will not alter the basic military balance in the region," it said.

The sale "will help improve the security of the recipient and assist in maintaining political stability, military balance and economic progress in the region," it said.

Congress has the right to reject the sales but such a move is highly unlikely, with lawmakers pushing for the United States to go further and directly provide weapons to Taiwan rather than approving its purchase requests.

In a decades-long policy, the United States sells weapons to Taiwan to ensure its self-defense but only recognizes Beijing, which claims the self-governing democracy and has not ruled out seizing it through force.

Secretary of State Antony Blinken paid a rare visit to Beijing earlier in June in which his hosts vowed no compromise on Taiwan, although the two sides voiced hope at keeping up communication to keep tensions from boiling over.

Beijing twice in the past year has carried out military exercises in waters around Taiwan in response to gestures of support by top US lawmakers.