Workers at Australian LNG export facilities of Japanese energy firm Inpex have voted to escalate the strike action at all three sites to work stoppages of up to 8 hours per day, up from 4 hours currently, from June 11, which could further tighten the global gas markets amid the crisis. Dissatisfied with how Inpex has handled months-long negotiations over pay and work conditions, the Offshore Alliance trade union said early on Monday that "We're ready to step up and take INPEX on, and are ramping up the 4-hour stoppages and bans which commenced…