Asian stock markets traded mixed on Wednesday, with caution prevailing as investors digested hawkish remarks from new Federal Reserve Chair Kevin Warsh and looked ahead to the crucial US non-farm payrolls figures for June. Warsh, speaking at a bankers' conference in Portugal, emphasized taming inflation as his top priority, indicating that the central bank is likely to hike interest rates in the coming months. He reiterated that the Fed is "in price stability business" and refused to offer forward guidance, dampening expectations for looser monetary policy. This stance comes as recent data shows inflation running above the Fed's 2.0 percent target and the US economy remains robust.

The prospect of higher US interest rates significantly impacted currency markets, with the dollar benefiting from increased rate hike expectations. The Japanese yen, in particular, struck a fresh 40-year low against the US dollar, sinking below levels that previously triggered intervention by Japanese authorities in April. This prompted analysts, such as Trade Nation's David Morrison, to suggest a "game of chicken" between traders and authorities regarding potential intervention. Despite a slight rebound, the yen's weakness was described as a "nightmare for Japan's policymakers."

Stock market performance in Asia was varied. Japan's Nikkei 225 gained 0.6 percent, extending its strong performance, while South Korea's main index fell about 2 percent. Shanghai's Composite Index rose 0.4 percent. Despite some regional gains, profit-taking was evident after strong rallies in the previous quarter, particularly in tech-related stocks. The US non-farm payrolls data for June, due on Thursday, is now a key focus, with a strong reading expected to further fuel rate hike expectations and potentially deal a blow to stocks, while a weaker reading could provide a boost. The ADP National Employment Report released Wednesday showed private employment rising by 98,000 jobs, below economists' forecasts of 118,000.

Oil prices also saw declines, with U.S. crude falling 2.03 percent to $68.09 a barrel and Brent crude dropping 2.44 percent to $71.17 per barrel. This downward movement followed Warsh's comments and easing supply concerns, as optimism surrounding US-Iran talks helped to assuage fears of prolonged disruptions, particularly after analysts cut their 2026 oil price forecasts for the first time since the Iran conflict began. However, Brent and West Texas Intermediate (WTI) crude remain up almost 20 percent year-to-date despite the recent declines.