Tensions over Ukraine are entering a critical period, driving up prices of raw materials key to the global economy, and piling pressure on governments already struggling with surging inflation. The US has warned that Russia could attack its neighbor as early as this week, even though Moscow has repeatedly denied it plans to invade. Markets have been on edge for weeks, and an actual conflict -- or sanctions on Russia -- could drive energy and food prices even higher, and push Europe into a major supply crisis.
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