Supply chain disruptions stemming from the US-Israeli war on Iran are creating significant challenges for Japan's shipbuilding industry. Imabari Shipbuilding, the country's largest shipbuilder, warned that rising costs and tightening availability of petroleum-derived materials are complicating vessel construction. Supply problems have emerged for marine fuel oil, lubricating oil, and paint, as Japanese yards grapple with historical order backlogs.

The bottlenecks reflect widening fallout from Middle East oil supply disruptions, which Asia relies on heavily for manufacturing materials. China, South Korea, and Japan—the world's top shipbuilding nations—face these challenges as yards race to meet backlogs requiring delivery beyond 2029. Nippon Paint already raised prices 75% for paint thinners, while suppliers negotiate delivery times and price increases. South Korean yards currently report sufficient inventories but could be affected if the conflict persists.

The supply constraints coincide with a contracting dry-bulk ship market, where new-build orders fell from 45 in January to zero in April. If disruptions persist in China and South Korea—the top shipbuilding nations—the effects could ripple through global gas markets. Industry executives warn insufficient LNG vessels will be built by 2030 to meet planned export infrastructure needs, potentially straining energy transportation networks worldwide.