Iran deployed a 30-year-old oil tanker for the first time in years to act as emergency floating storage as the U.S. blockade of Iranian ports throttles its exports, a sanctions monitoring group said. The large crude carrier Nasha , which can hold up to 2 million barrels of oil, was visible on public ship-tracking services last week as it sailed in the Persian Gulf toward Kharg Island, Iran’s main export terminal. On Sunday, satellite imagery showed the supertanker, which measures nearly 1,100