Many countries worldwide have been hit hard by the energy crisis that has emerged following the U.S.-Israeli attacks on Iran and ensuing conflict, with severe oil and gas shortages driving energy prices sky high. But while some countries are suffering badly, China so far appears relatively untarnished, following several years of preparation aimed at boosting the Asian giant’s energy and national security and reducing reliance on foreign powers. China has been stockpiling vast quantities of oil in recent years, with a 1.3-billion-barrel…