The JKM-TTF arbitrage more than doubled, with JKM printing $18.86/MMBtu on Friday 12 June against a TTF equivalent near $13.6, up from a far narrower gap on 11 June 1. JKM, the Japan Korea Marker, is the Northeast Asian spot-LNG benchmark; the arb is the gap that decides whether a flexible Atlantic cargo sails east or west. The implied spread works out to roughly $5.26/MMBtu, a figure that should be read as approximate, because it converts the EUR-denominated TTF print into USD/MMBtu across a few-day date offset; the sourced anchor is JKM at $18.86 and the direction of the pull.
The arb had compressed to $1.225 in the week to 1 June before diverging from the flat prompt . At that compressed level a cargo sat near the round-trip threshold between basins. At roughly $5.26 the economics firmly favour Asia, and a flexible US or Atlantic Basin cargo routes east rather than discharging into Europe.
The direction is the opposite of what Europe needs in injection season, when terminals want every spare cargo. This is the genuine supply tightening in the briefing, and the 17 June ban does nothing about it, because the regulation covers pipeline gas, not seaborne LNG. The one force actually pulling molecules away from Europe sits entirely outside the measure's scope, which is why the prompt can fall through its floor in the same week a real tightening is underway.
