China on Wednesday reaffirmed its threat to use military force to bring self-governing Taiwan .

The statement issued by the Cabinet’s Taiwan Affairs Office and its news department followed almost a week of missile firings and incursions into Taiwanese waters and airspace by Chinese warships and air force planes.

The actions have disrupted flights and shipping in a region crucial to global supply chains, prompting strong condemnation from the U.S., Japan and others.

An English-language version of the Chinese statement said Beijing would “work with the greatest sincerity and exert our utmost efforts to achieve peaceful reunification.”

“But we will not renounce the use of force, and we reserve the option of taking all necessary measures. This is to guard against external interference and all separatist activities,” the statement said.

“We will always be ready to respond with the use of force or other necessary means to interference by external forces or radical action by separatist elements. Our ultimate goal is to ensure the prospects of China’s peaceful reunification and advance this process,” it said.

China says the threatening moves were prompted by a visit to Taiwan last week by U.S. House Speaker Nancy Pelosi, but Taiwan says such visits are routine and that China used that merely as a pretext to up its threats.

In an additional response to Pelosi’s visit, China said it was cutting off dialogue on issues from maritime security to climate change with the U.S., Taiwan’s chief military and political backer.

Taiwan’s foreign minister warned Tuesday that the Chinese military drills reflect ambitions to control large swaths of the western Pacific, while Taipei conducted its own exercises to underscore its readiness to defend itself.

Beijing’s strategy would include controlling the East and South China seas via the Taiwan Strait and imposing a blockade to prevent the U.S. and its allies from aiding Taiwan in the event of an attack, Joseph Wu told a news conference in Taipei.