The United States has begun a blockade of Iranian ports in the Strait of Hormuz, a critical waterway for global oil shipments. Despite this, Iran may endure the blockade for weeks or even months due to a substantial stockpile of crude oil, estimated at 160 million barrels, stored on tankers outside the Persian Gulf. According to a report by the Wall Street Journal, Iran's oil exports have surged recently, reaching 1.84 million barrels per day last month, with even higher figures in February. This increase is attributed to heightened tensions with the US and Israel, prompting Iran to ramp up its exports. The majority of Iran's crude is sold to independent Chinese refiners, known as 'teapot' refiners, who account for over 90% of its oil exports. However, these refiners are limited by annual quotas on imports, which means they cannot immediately absorb all of Iran's excess oil. As a result, the existing stockpile could help Iran maintain its supply to China until at least mid-July, even if shipments through the Strait of Hormuz are interrupted. The US blockade comes amid escalating tensions, with President Donald Trump warning that any Iranian vessels approaching US ships enforcing the blockade will be destroyed.