The United States has opted not to extend a waiver that permitted limited Iranian oil shipments, marking a significant shift towards stricter enforcement of sanctions. This decision, effective from this week, affects countries reliant on Iranian oil, including India and China, potentially leading to increased costs and supply disruptions. Previously, the waiver allowed nearly 140 million barrels of oil to enter global markets, helping to stabilize supply amid regional conflicts. With its expiration, countries may now face penalties for transactions involving Iranian oil, as the US has indicated it may impose secondary sanctions on entities involved. Additionally, US naval forces are enforcing a blockade on maritime traffic to and from Iran, further escalating tensions. This crackdown includes increased scrutiny of international banking networks allegedly linked to Iranian financial activities, with the US Treasury urging countries like China and the UAE to take swift action against illicit transactions. The overall impact could lead to rising oil prices, which have already surged by over 50% since the onset of the conflict, affecting consumers and refiners alike.