Asia stocks decline as oil surge, bond yields weigh; Australia Q2 GDP beats

Asian markets experienced a sharp decline on Wednesday, with Japanese and South Korean stocks leading the market-wide losses. The decline was triggered by a surge in global oil prices, which in turn pushed up bond yields and raised doubts about central banks' readiness to maintain easy monetary policies.

The Nikkei 225 index in Japan dropped 2.7%, while the broader TOPIX index fell 2.2%. Investors are closely watching the Bank of Japan's upcoming interest rate decision later in the month. Earlier, Bank of Japan Governor Kazuo Ueda indicated that the central bank would continue to consider rate hikes and evaluate if economic and price conditions align with its expectations.

In South Korea, the KOSPI index declined by 3%, with major companies like Samsung Electronics and SK Hynix falling over 3%. The decline in Korean stocks followed a rise in Brent crude futures to around $96 a barrel, following earlier gains that pushed them to a five-week high. The increase in oil prices has raised concerns about potential inflationary pressures, which could complicate central banks' outlook and intensify pressure on government bonds.

U.S. bond yields rose to 4.804% for the 10-year Treasury, its highest level since January 2025, while Japan's 10-year government bond yield touched 3%. These yield movements added to the pressure on rate-sensitive technology and growth stocks across the region. In addition to oil price concerns, markets were also reacting to expectations of a potential Federal Reserve rate hike this month and the broader implications for the U.S. dollar.