OSLO (Reuters) – Wage talks between Norwegian oil firms and the industry’s biggest labour union broke down on Wednesday and will switch to state-led mediation in a bid to prevent strike action by workers, the Industri Energi union said. If Norway’s government-appointed mediator is unable to broker a deal, union members will be eligible to go on strike, disrupting output from western Europe’s largest oil and gas producer. Mediation in this year’s talks is expected to take place in June, according to the Norwegian Oil and Gas Association, although no date has so far been set. Norway produces aro…