TAIPEI, Taiwan — Japan “crossed a red line” with comments by its new leader suggesting a potential military intervention over Taiwan, Chinese Foreign Minister Wang Yi said Sunday.

Beijing's latest response to Japanese Prime Minister Sanae Takaichi’s Taiwan comments is adding to uncertainty for businesses caught in the middle.

A Japanese official blasted China’s claims that Prime Minister Sanae Takaichi has altered Japan’s position on a Taiwan crisis as “entirely baseless,” calling for more dialogue to stop ties between Asia’s top economies spiraling.

Japan and China recently agreed to cooperate more economically. Now, climbing tensions are threatening that cooperation.

As China reportedly mulls a ban on Japanese seafood amid a standoff between the Asian neighbors, Taiwan's leader shows support for Tokyo, with his lunch.

Chinese diplomats airing hawkish views, known as "wolf warriors", have returned to the global stage, drumming up criticism of Japan's prime minister in countries that suffered from its military actions during World War Two.

China sent a letter to the United Nations vowing resolute self-defense if Japan “dared to intervene militarily in the Taiwan Strait,” as Beijing tries to rally international support for its position on the spiraling spat.

Tension between Japan and China has escalated over the new Japanese leader's suggestion Tokyo could intervene militarily if Beijing attacks Taiwan.