China is trying to impose economic costs on Japan for wading into the issue of Taiwan. But experts say the escalating dispute could ultimately hurt China too.

The remarks come amid the two countries’ worst diplomatic crisis in years, after the Japanese prime minister said a Chinese attack on Taiwan could trigger a military response from Tokyo.

Ukrainian sumo wrestler Aonishiki is only 21 but has moved just one step from the top rank of Japan's national sport. In an elaborate ceremony on Wednesday, he was promoted by the Japan Sumo Association to the rank of ozeki,

The impact is especially pronounced in Japan, which the United Nations has classified as a " super-aged" society —meaning at least 20 percent of the population is over 65. In Japan, that figure is close to 30 percent. Newsweek reached out by email to Japan 's Foreign Ministry with a request for comment.

The workaholic new prime minister is riding high despite the perils of a fight with Beijing.

Japan's government stands ready to take "necessary" action in the market with a close eye on whether exchange-rate moves reflect economic fundamentals or are driven by speculative action, Prime Minister Sanae Takaichi said on Wednesday.

Two strong earthquakes struck Japan Tuesday at magnitudes of 5.4 and 4.7, according to data from the United States Geological Survey ( USGS ). The first quake struck in the Pacific Ocean about 80 miles east-southeast from Kitaibaraki at a depth of around 6 miles, 10 km, the data shows. Kitaibaraki is about 110 miles northeast of Tokyo.