TOKYO, April 27 : JERA, Japan's biggest power generator, has secured adequate liquefied natural gas inventories through July to cover Middle East supply disruptions caused by the U.S.-Israeli war with Iran, an executive said on Monday. JERA, also Japan's top LNG buyer, handles about 35 million metric tons annually of imports and trading, of which roughly 27 million tons are used domestically. About 5 per cent of its Japan-bound shipments pass through the Strait of Hormuz, where the conflict has