Yemen’s war — largely quiet since 2022 — just erupted again. Here is what happened, and the background you need to understand it.

What just happened?

On Thursday, Houthi fighters attacked military camps belonging to Yemen’s government in two provinces, Marib and Hadramout, using ballistic missiles and drones. Yemen’s state news agency said at least 30 government soldiers were killed; medical sources told the news agency AFP the toll was at least 38 killed and 29 injured. Al Jazeera described it as the fiercest military escalation in Yemen since 2022.

Who is fighting whom?

Yemen has been split by civil war for roughly a decade. On one side are the Houthis, an armed movement backed by Iran, which controls the capital Sanaa and much of the country’s north. On the other side is Yemen’s internationally recognized government, supported by a military coalition led by neighboring Saudi Arabia.

In 2022 the two sides reached a truce. It was never a formal peace, but it largely stopped the large-scale fighting — until now.

Why is it flaring up now?

The Houthis say they attacked because of what they describe as a military buildup backed by Saudi Arabia in those provinces. But the timing is bigger than Yemen itself: news outlets including France 24 report that Yemen’s conflict is becoming the latest front in the wider confrontation between the United States and Iran. The Houthis are Iran’s closest ally on the Arabian Peninsula, and pressure on Iran tends to echo through Yemen.

Why does it matter to the rest of the world?

Three reasons. First, the human cost: Yemen already suffered one of the world’s worst humanitarian crises during the war years, and renewed fighting puts aid, food supplies and civilians at risk again. Second, geography: Yemen sits beside the Red Sea shipping lanes that carry a large share of global trade, and the Houthis have attacked ships there before. Third, escalation risk: every new front in the US–Iran confrontation makes the wider conflict harder to wind down.

What to watch next

Whether Saudi Arabia responds militarily, whether the 2022 truce is declared dead, and whether the attacks spread toward the coast and shipping lanes. Any of those would turn a bad day into a much bigger story.

Sources: Just Security / NYT / Reuters, Al Jazeera via Havana Times, France 24 / AFP via GoLocalProv.