Three days after the flight arrived in Yemen, Reuters reported that Tehran had asked the Houthi movement to stand ready to close the Red Sea oil route if the U.S. struck Iranian power infrastructure, posing a new threat to global energy supplies.
On Monday, the group, whose area of control in Yemen overlooks the waterway, announced a naval blockade of Saudi Arabia in response to the July 13 bombing of Sanaa airport, which they said was carried out by Saudi Arabia.
The moves signalled the end of a four-year truce between Riyadh and the Houthis. Their threat to one of the world's top maritime trade routes escalated further on Thursday when the group said it had attacked two Saudi oil tankers.
Moammar al-Iryani, information minister in Yemen's Saudi-backed government, confirmed the transfers of Guards personnel and equipment in a telephone interview with Reuters on Wednesday, citing intelligence.
"Their mission is to strengthen the militias' military capabilities and prepare them to threaten international maritime security in the Red Sea and the Bab al-Mandab Strait," he said.
Mzahem Alsaloum, a security and intelligence analyst who has tracked the Houthis and other Iranian-backed groups for years, also confirmed the IRGC experts' arrival on the July 13 flight.
At a press conference in Tehran on July 20, Foreign Ministry spokesperson Esmaeil Baghaei said the flight to Sanaa on July 13 was intended to take home a Houthi delegation who had gone to Tehran for the funeral of slain Iranian Supreme Leader Ayatollah Ali Khamenei, as well as Yemeni citizens who had received medical treatment in Iran.
On July 3, the aircraft flew the group of about 200 people, including senior officials, women and children, to Iran for the funeral. On July 13, the four sources said, the aircraft returned to Yemen carrying members of the delegation as well as the IRGC commanders and advisers. Before it could land in Sanaa, the Saudi-backed government struck the airport, forcing the aircraft to divert to Houthi-controlled Hodeidah.
The Houthi military said the Saudi warplanes that launched the airport attack were forced to leave Yemeni airspace.