'Iran is in for the long haul' with oil tanker hijacks, expert says, as U.S. considers more sanctions

The containership MSC Aries seized by Iran over the weekend marked at least the sixth vessel hijacked by Iran and its proxies in response to the Israel-Gaza war, and it's adding to the challenges to longstanding freedom of navigation principles that maritime shipping relies on.

Before this weekend's tanker seizure, the last vessel Iran hijacked was the St. Nikolas on January 1. According to U.S. Naval Forces Central Command, that brought the total number of vessels being held to five, and over 90 crew members hostage. Previous to that, the Iranian-backed Houthis hijacked The Galaxy Leader on November 19.

The latest development has shipping and energy experts bracing for a long-term timeline of uncertainty.

"Iran is in this for the long haul," said Samir Madani, co-founder of Tankertrackers.com, an independent online service that tracks and reports crude oil shipments in several geographical and geopolitical points of interest.

The MSC Aries was identified by Iran as having a link to Israel. The containership has a carrying capacity of 15,000-TEUs (twenty-foot equivalent containers). MSC chartered the vessel, but it is owned by Israeli billionaire Eyal Ofer's Zodiac Maritime.

MSC declined to comment.

Madani said he does not expect a quick release or negotiation of a release. "They will hold the MSC Aries for a long period. Iran has been holding some tankers for about a year, if not longer now," he said.

According to Tankertracker information, Madani said the vessel is being held in the Khuran Straits, not too far from three other tankers Iran hijacked: the Advantage Sweet, Niovi, and St. Nikolas.

As the U.S. considers more sanctions against Iran in response to its recent attack on Israel, Iran has been using the hijacked ships as