- Summary- Companies- First Venezuelan oil destined for United States in four years- Chevron also ships light oil for use by its joint oil venture- Tough challenges ahead for any further easing of U.S. sanctionsHOUSTON, Dec 30 (Reuters) - U.S. oil company Chevron Corp (CVX.N) is sending two oil tankers to Venezuela, one of which will load the first cargo of crude destined for the United States in nearly four years, according to a person familiar with the matter and shipping data.MORE FLEXIBLE TERMSAnalysts said the new oil flows could set the stage for additional concessions by the administrations of Venezuela's Socialist President Nicolas Maduro and U.S. President Joe Biden."There might be new licenses, not out of promises but out of verifiable changes," added Fernando Fernandez, a Venezuelan lawyer and expert in sanctions.FIRST U.S. LOADINGThe Bahamas-flagged tanker Caribbean Voyager is set to load Venezuelan oil for exports to the United States in the coming days, while the Marshall Islands-flagged UACC Eagle is sailing to Venezuela's Jose oil port to discharge naphtha for the joint venture Petropiar, according to the person and Refinitiv Eikon vessel monitoring data.Chevron earlier this year had requested a broader license that would allow it to take operational control of its joint ventures in Venezuela, but Washington opted for a limited authorization set to be scalable as political talks progress."