Japan and South Korea Swap Gas for Coal as Blockade Tightens LNG Supply

Japan and South Korea Swap Gas for Coal as Blockade Tightens LNG Supply A War on the Rocks essay revives the chokepoint-deterrence debate just as Asian buyers burn more coal, lifting Newcastle and Asian LNG prices. War on the Rocks published an essay on Thursday (2026-06-11) arguing that modern supply chains are too tightly interlinked to survive a war, with critical inputs converging on a handful of irreplaceable nodes that break the chain if any one is removed.⁵ The thesis lands while Asian power producers live through exactly that kind of disruption. A blockade that has cut LNG shipments has pushed Japan and South Korea, two of the world's largest LNG importers, to swap gas for coal in their generation stacks, Reuters reported.³ The switch shows up in the burn data. In Japan, coal-fired power supply rose 11.1% in April, the fastest pace in at least a year, while gas-fired output fell 12.9% to 16,447 gigawatt-hours, Reuters reported, citing Japanese Electricity Market data.³ South Korea moved harder. Coal-fired supply jumped 39.7% year over year to 10,733 gigawatt-hours in April, the biggest increase since August 2019, while gas-fired output dropped 6.4%, according to Korea Power Exchange data cited by Reuters.³ The substitution accelerated into the month. Reuters said coal-fired supply was up 18.3% in Japan and 14.7% in South Korea over the first 10 days, while gas-fired power fell 23.4% and 12.2% respectively.³ Prices followed. Asian spot LNG has risen 62% since the start of the war and the Newcastle coal benchmark has climbed 13%, according to Reuters.³ The supply hole is large. Reuters reported that the conflict knocked out 17% of Qatar's LNG export capacity, sidelining one of the world's most important gas exporters.³ A separate trade estimate put the damage at roughly 12.8 million tonnes per annum of Qatari capacity, with recovery timelines running as long as five years.¹ Consultancies have cut their numbers. Leading energy advisers have collectively reduced global LNG supply projections by as much as 35 million tonnes, a forecast that, if it holds, keeps Asian gas short well beyond the immediate conflict.¹ The coal pull is broadening. Reuters reported that May coal imports by other Asian buyers are set to rise 9.4% year over year to 31 million tonnes, citing London-based DBX Commodities.³ South Korea's coal imports are on track to climb more than 50% in May and Japan's by more than 20%, while Vietnam's electricity-grade coal imports hit a record 5.4 million tonnes in April on Kpler data, Reuters reported.³ This is where the deterrence thesis runs into the tape. The claim that interlinked supply chains prevent conflict assumes buyers fear the disruption enough to avoid it, yet the shipping route is disrupted now and the response has been adaptation rather than paralysis, with importers reaching for the dirtiest available substitute and paying up for it.^5,3 Japan's own conduct shows how selective that adaptation is. Tokyo has built its economic-security policy around reducing risks from chokepoints such as semiconductors and medical equipment, yet it broke ranks with U.S. allies to buy Russian crude above the $60 price cap when the economics demanded it.^4,2 When a chokepoint binds, large importers optimise for keeping the lights on, not for alliance discipline. The unresolved risk is duration. A five-year Qatari recovery timeline and a 35-million-tonne supply cut would lock in the coal-for-gas trade across Asia rather than reverse it.¹ What decides whether April's burn shift was a spike or the start of a multi-year pattern is how fast Qatari liquefaction trains come back.^1,3