Japan’s Nikkei 225 stock average vaulted past the 70,000 mark for the first time on Tuesday, propelled by a widely anticipated interest-rate increase from the Bank of Japan. The index rose as high as 70,020.68 in afternoon trade before settling at a record closing high of 69,404.50, a gain of 0.1 per cent. The central bank lifted its key policy rate by a quarter point to 1 per cent — the highest level in 31 years — and signalled that a planned reduction in its bond purchases would not begin until April 2027. The move, viewed from Tokyo, was read as a vote of confidence in the durability of Japan’s economic recovery, yet the broader Topix index slipped 0.2 per cent, hinting at lingering caution beneath the headline milestone.

In currency markets, the yen barely budged, hovering around 160 to the dollar — a threshold that has repeatedly drawn verbal warnings and past intervention from Japanese authorities. The lack of hawkish forward guidance in the BOJ’s statement left the door open for further yen weakness, a dynamic that has historically buoyed exporter shares but unsettled policymakers concerned about imported inflation. Analysts in London noted that the decision to pause the tapering of bond purchases until 2027 underscored the central bank’s gradualist approach, even as it normalises rates from their emergency settings.

Across the region, the Nikkei’s milestone stood in contrast to a more muted mood. South Korea’s Kospi extended its record-breaking run, rising 2.1 per cent, while Shanghai’s composite index was barely changed and Hong Kong stocks declined. The initial exuberance over a preliminary US-Iran accord — which had lifted Asian equities in the previous session — gave way to a more sober assessment. Oil prices, which had settled at a three-month low overnight, edged higher but remained subdued, as shippers warned that rebuilding confidence to transit the Strait of Hormuz would take weeks. The MSCI index of Asia-Pacific shares outside Japan erased early gains to trade flat.

Viewed from Washington, the Iran deal’s fragile promise added a layer of geopolitical uncertainty to a region already navigating divergent monetary paths. While the BOJ tightened cautiously, other Asian central banks are watching the Federal Reserve’s next moves and the trajectory of the dollar. The Nikkei’s brief foray above 70,000 underscores the resilience of Japanese equities, but the broader Topix’s decline and the yen’s proximity to intervention levels suggest that the rally rests on narrow foundations. Investors now turn to the BOJ governor’s press conference for clues on the pace of future hikes, aware that any misstep could quickly unwind the historic gains.