Kazakhstan has filed for arbitration in a Swiss court in its lawsuit against major international oil firms as the OPEC+ producer seeks billions of U.S. dollars of damages from Big Oil over contract delays, bribery, and cost overruns, sources familiar with the matter told Bloomberg. The country, where international majors including ExxonMobil, Chevron, Shell, Eni, and TotalEnergies, have developed massive oilfields, has two separate arbitration cases with as much as $166 billion in claims against the majors for damages, mostly because of lost revenues…