The relief rally that swept through global markets after a US-Iran deal reopened the Strait of Hormuz lasted about as long as most New Year’s resolutions. Asian equity markets hit a wall of uncertainty on June 16 as two major central bank decisions loomed, cooling a run that had pushed the S&P 500 up 1.7% and the Nasdaq 100 up 3.1% in the prior session.

US futures slipped into the red. Brent crude fell below $83 per barrel. And traders across Asia braced for what turned out to be a meaningful policy divergence: the Bank of Japan raised rates while the Reserve Bank of Australia stayed put.

BOJ goes hawkish, RBA hits pause

The BOJ raised its key short-term interest rate by 25 basis points to 1.0%, the highest level since September 1995. The vote came in at 7-1 in favor of the hike. Rising energy costs and a weakening yen forced the board’s hand, with inflation pressures making the case for tightening increasingly difficult to ignore.

On the other side of the Pacific, the RBA chose a different path entirely. Australia’s central bank held its cash rate at 4.35%, marking its first pause after three consecutive hikes earlier in 2026.

Neither decision was a surprise. Pre-decision probability polls indicated a 94-99% chance of the BOJ hike and over 97% likelihood of the RBA hold. Markets had priced both outcomes in, which explains why the immediate reactions were relatively orderly rather than chaotic.

The MSCI World Index, which had posted over 1% gains across the previous three sessions, started showing cracks as the implications of Japan’s rate trajectory sank in.

What the US-Iran deal giveth, central banks taketh away

Around June 14, the US and Iran announced a deal that reopened the Strait of Hormuz, a chokepoint through which roughly a fifth of the world’s oil supply flows. Markets exhaled. Stocks surged. Oil prices dropped as supply fears evaporated.

Japan’s rate increases have historically sent shockwaves through global carry trades. Investors who borrow cheaply in yen to fund positions in higher-yielding assets suddenly face higher borrowing costs. When that trade unwinds, it can pull liquidity out of markets rapidly and without much warning.

Bitcoin holds steady, but the real test is ahead

Bitcoin traded between $65,600 and $66,000 around the BOJ announcement. The crypto market’s muted reaction reflects that first-order effects were already anticipated, given that pre-decision polls had shown near-unanimous expectations for the BOJ hike.

Liquidity conditions are the variable that matters most here. Japan raising rates to 1.0% tightens global financial conditions at the margin, reducing the pool of cheap capital available for speculative investments. Bitcoin’s correlation with liquidity conditions has been well-documented, and a sustained tightening cycle from the world’s third-largest economy is not something to dismiss lightly.

Traders navigating this environment should pay close attention to the yen’s trajectory in the days ahead. A strengthening yen would signal carry trade unwinding, which historically precedes broader risk-off moves. A stable or weakening yen, despite the rate hike, would suggest markets view the BOJ’s move as a one-and-done rather than the start of a sustained tightening cycle. That distinction will likely determine whether Bitcoin’s hold near $66,000 turns into a launching pad or a ledge.