• Japan's June import bill hit an all-time high of $89.46 billion, up 25.4% year-on-year, per Reuters' citation of Japanese government trade data.
• The headline number masks a sharper split: oil-import value rose 59.3% year-on-year while oil-import volume fell 13.7% — Japan bought less oil and paid far more for it.
• International crude benchmarks did the work: Brent and WTI are both up over 60% year-to-date, and Bloomberg data cited by Saxo Bank puts international oil prices up more than 50% over the twelve months to last July.
• Daiwa Institute of Research economist Koki Akimoto is quoted saying Japan's supplier diversification is progressing, with purchases from the United States and Russia's Sakhalin supply surging as reliance on the Middle East — once as high as 95% — eases.
• The source separately reports Strait of Hormuz traffic down roughly 90% versus pre-March 2026 levels; treat that figure, like the diversification claim, as reported rather than independently verified.

Japan's oil-import bill hit $89.46 billion in June, an all-time high, per Reuters' citation of Japanese government trade data — up 25.4% year-on-year overall. Underneath that headline figure, oil imports by value alone rose 59.3% year-on-year, while oil-import volume fell 13.7% over the same period. That split settles the price-versus-volume question directly: Japan bought less oil in June than a year earlier and still paid far more for it, because the barrels themselves cost more. This is analysis, not advice.

The split: value up, volume down

The reported math is unambiguous once value and volume are separated. Japan's oil-import value rose 59.3% year-on-year in June, according to the government data Reuters cited, while the volume of oil imported fell 13.7% over the same period. A bill that rises even as physical volume declines can only be a price story — the cost per barrel rose enough to overwhelm a genuine drop in tonnage. The overall 25.4% import-bill increase covers all imports, not oil alone, so the oil-specific split is the more precise read on what moved.

What repriced

International crude did the repricing. Bloomberg data cited by Saxo Bank shows international oil prices up more than 50% over the twelve months to last July. Separately, and on a different window, Brent crude and WTI are each up more than 60% year-to-date, per the same sourcing chain. Two benchmarks moving together at that scale points to a broad crude repricing rather than a benchmark-specific dislocation — consistent with Japan's oil-import value rising even as the volume it bought fell. This is analysis, not advice.

Supply mix: away from the Middle East, reported not confirmed

Daiwa Institute of Research economist Koki Akimoto is quoted saying Japan's diversification of oil-procurement origins is progressing, with purchases from the United States and Russia surging while declines in Middle East imports have moderated. Japan has historically relied on the Middle East for as much as 95% of its oil imports; named alternate suppliers include the United States, Azerbaijan, South Sudan and Russia's Sakhalin supply. Separately, the source reports Strait of Hormuz traffic down roughly 90% versus pre-March 2026 levels. Both figures should be read as reported, not as independently verified origin-by-country volumes.

What to watch

The next government trade release will show whether June's price-driven bill was a peak or a staging point, particularly if Brent and WTI hold near current levels. A falling import volume alongside a rising bill is also a currency question: Japan settles most crude in dollars, so yen weakness would add to the dollar-price effect already reflected in the 59.3% oil-value increase. Any further shift toward U.S., Azerbaijani or Sakhalin-origin barrels — beyond Akimoto's qualitative description — should show up in origin-by-country customs data before it shows up in commentary.