Oil prices surged Tuesday, with U.S. crude hitting its highest level since July 2014 as Russia bears down on Ukraine’s capital.

Prices first topped the $100 mark last Thursday when Russia invaded Ukraine, prompting fears of supply disruptions from key exporter Russia, in what is already a very tight market.

West Texas Intermediate crude futures, the U.S. oil benchmark, jumped 5.7% to trade at $101.17 per barrel.