June 8 - Yemen's Iran-aligned Houthis said on Monday that they would ban ships linked to Israel from the Red Sea after Israel renewed its military attacks on Iran, adding to concerns about global shipping and energy flows.
This is why it matters and what it means for the Iran war and the global energy crisis:
HOW BIG IS THE RISK TO GLOBAL ENERGY MARKETS?
Iran's closure of the Strait of Hormuz since Israel and the United States attacked it on February 28 has disrupted most oil and other energy exports
from the Gulf, raising prices and causing a major energy shock.
Saudi Arabia has responded by diverting more than 70% of its normal daily crude exports to the Red Sea port of Yanbu.
That has been a lifeline for the energy market, helping to keep down global oil prices.
Any sustained Houthi disruption to Red Sea shipping including potential attacks on shipping or ports could be a big problem.
A Houthi source told Reuters preventing Israeli ships from transiting the Red Sea was "a first step" but that if escalation continued, the group would stop any ships heading to Israel as well as other measures.
When the group attacked shipping during the Gaza war its stated target of Israel-linked vessels included any vessel belonging to any company that used Israeli ports and its attacks on those ships dissuaded most companies from using the route.
WHO ARE THE HOUTHIS?
The Houthis emerged as a military, political and religious movement in north Yemen in the 1990s, fighting guerrilla wars against the government in Sanaa.
They adhere to the Zaydi sect of Shi'a Islam, and after the 2011 Arab Spring they strengthened ties with Iran and seized on instability to capture the capital in 2014, derailing a Gulf-backed political transition plan.
Saudi Arabia and Arab allies launched a military intervention months later to restore the ousted government and dislodge a group it saw as a proxy for Iran, Riyadh's arch regional rival.
As Yemen's civil war ground to a stalemate, the Houthis attacked oil installations and other infrastructure in Saudi Arabia and the United Arab Emirates with missiles and drones.
However, a 2022 truce between Yemen's warring sides has largely held.
ARE THE HOUTHIS AN IRANIAN PROXY?
Iran champions the Houthis as part of its regional "Axis of Resistance", which includes Lebanon's Hezbollah and Iraqi Shi'ite militias, though its ties with the Yemeni movement are less clear than with those other groups.
The Houthis do not recognise Iran's supreme leader as their ultimate religious authority in the same way Hezbollah and the Iraqi groups do. Its motivations are mainly domestic, though it is ideologically aligned with Iran.
The U.S. says Iran has armed, funded and trained the Houthis with help from Hezbollah. The Houthis deny being an Iranian proxy and say they develop their own weapons.
WHAT HAPPENED WHEN THE HOUTHIS ATTACKED RED SEA SHIPS BEFORE?
After the October 7, 2023, Hamas attack on Israel, and Israel's devastating campaign in Gaza, the Houthis began firing at Israel and on international shipping in the Red Sea, saying they were doing so in support of Palestinians.
The Houthi attacks in the Red Sea severely disrupted global shipping, prompting Maersk, Hapag-Lloyd and other major companies to divert around Africa - a far longer, more expensive route.
A U.S.-led mission to restore free navigation in the Red Sea involved repeated strikes on Houthi targets and a defensive campaign that shot down hundreds of drones and missiles.
But some Houthi attacks continued until last summer, only ending completely with the Gaza ceasefire in October.
WHAT HAVE THEY DONE DURING THE LATEST IRAN WAR?
While Hezbollah and the Iraqi groups joined the war early with rocket and drone fire after the first U.S. and Israeli strikes on Iran, the Houthis have been comparatively quiet.
The group's leader Abdul Malik al-Houthi said on March 5: "Our fingers are on the trigger at any moment should developments warrant it".
Iranian military commanders have repeatedly warned the Houthis could join the war, with Revolutionary Guards Quds Force commander Esmaeil Qaani saying on June 1 they could choke off the Red Sea.
But before this week, the group's only involvement was a few missile and drone attacks on Israel in late March and early April.
Why the Houthis have been relatively quiet so far is not entirely clear.
They and Iran may have wanted to use the threat of another major energy route closure to warn Israel and the United States off further escalations.
The Houthis may also feel less committed to Iran's security than do Tehran's other regional allies.
And the group may not want to antagonise its powerful, wealthy neighbour Saudi Arabia and risk reigniting the conflict at home.
(Compiled by Angus McDowall; editing by Jason Neely)
