Beijing summoned Japan's envoy and chided Britain Monday in a fierce response to the Group of Seven (G-7) summit in Hiroshima.
State-backed Chinese mouthpiece Global Times, in the meanwhile, called the G-7 an "anti-China workshop" on Monday.
A joint communique issued Saturday singled out China on issues from Taiwan and nuclear arms, to economic coercion and human rights abuses, underscoring the wide-ranging tensions between Beijing and the group of rich countries which includes the United States.
"The U.S. is pushing hard to weave an anti-China net in the Western world," Global Times said in an editorial Monday titled 'G-7 has descended into an anti-China workshop.'"
"This is not just a matter of brutal interference in China's internal affairs and smearing China, but also an undisguised urge for confrontation between the camps".
Beijing's Foreign Ministry said it firmly opposed the G-7 statement and late Sunday said it had summoned Japan's ambassador to China as part of a pointed protest to the summit host.
Russia, a close ally of China that was also called out in the G-7 statement over its invasion of Ukraine, said the summit was an "incubator" for anti-Russian and anti-Chinese hysteria.
Separately, China's embassy in Britain urged London to stop slandering China on Sunday, after British Prime Minister Rishi Sunak said Beijing represents the world's greatest challenge to security and prosperity.
The communique issued by the Group of Seven (G-7) – which also includes Canada, France, Germany and Italy – mentioned China 20 times, the most in recent years and up from 14 mentions in 2022.
As well as taking issue with G-7 comments on Taiwan, which China claims as its own and says is an internal issue, Beijing also accused the U.S. and its allies of double standards over comments about a nuclear build-up and the use of economic leverage.
Despite Beijing's reaction, U.S. President Joe Biden said he expected a thaw in frosty relations with China "very shortly."
Some analysts, however, see no sign of any immediate easing of tensions, especially given Beijing's rapid rebuttal.
"Beijing’s reaction (especially the early timing of its release) underlines that tensions in the region are already quite high and likely to increase further," Moritz Rudolf, research scholar and fellow at Yale University's Paul Tsai China Center.
Chinese Vice Foreign Minister Sun Weidong summoned the Japanese ambassador to register protests over "hype around China-related issues," a ministry statement late on Sunday said.
Sun said Japan collaborated with the other countries at the G-7 summit "to smear and attack China, grossly interfering in China's internal affairs, violating the basic principles of international law and the spirit of the four political documents between China and Japan," referring to the China-Japan Joint Statement of 1972.
Japan's ambassador to China, Hideo Tarumi, said it was "natural" for the G-7 to refer to issues of common concern as it has done in the past and will continue to do so in the future as long as China does not change its behavior, according to a readout.
Wang Yiwei, an international relations professor at the Renmin University in Beijing, described China's overall reaction to the G-7 communique as "restrained" but singled out Japan as particularly provocative.
Wang referred to Japan's pick for the summit venue Hiroshima, the city flattened by an atomic bomb at the end of World War II, and its push for a joint statement on nuclear disarmament that raised concern about China's nuclear arsenal.
"The main thing that's happening here is Japan, using its position as the rotating chair, to create an anti-China movement," said Wang.
Among the G-7, Tokyo has also voiced some of the strongest concerns about China's muscular rhetoric around Taiwan, the democratic island that sits to the southwest of Japan.
Japan's Chief Cabinet Secretary Hirokazu Matsuno said during Monday morning briefing that the country's policy toward China has been consistent that it will insist on matters that is needed and urge responsible behaviour, while take steps to address concerns and cooperate on common issues.
